Hall-effect thruster (English Wikipedia)

Analysis of information sources in references of the Wikipedia article "Hall-effect thruster" in English language version.

refsWebsite

Global rank English rank

29web.archive.org

1^st place

6doi.org

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6nasa.gov

75^th place

83^rd place

3handle.net

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3spacenews.com

1,876^th place

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3pppl.gov

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2harvard.edu

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1space.com

936^th place

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1nih.gov

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1archive.org

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1ippt.gov.pl

low place

1semanticscholar.org

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1novosti-kosmonavtiki.ru

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1afit.edu

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1aiaa.org

7,940^th place

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1rocket.com

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1popsci.com

2,941^st place

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1newindianexpress.com

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1inc42.com

8,928^th place

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1indiatimes.com

17^th place

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1worldcat.org

5^th place

1permanent.com

low place

1sciencedaily.com

993^rd place

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1lenntech.com

low place

1spacex.com

6,194^th place

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1leonland.de

low place

1jaxa.jp

4,027^th place

6,129^th place

1diva-portal.org

3,588^th place

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1books.google.com

3^rd place

1ghostarchive.org

32^nd place

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1nro.gov

low place

1esa.int

1,482^nd place

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1ieee.org

652^nd place

515^th place

1scmp.com

362^nd place

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1chinanews.com

1,432^nd place

4,451^st place

1umich.edu

459^th place

360^th place

afit.edu (Global: low place; English: low place)

"AFIT SPASS Lab Achieves '(AF) Blue Glow'". Air Force Institute of Technology. 13 November 2007. Archived from the original on 22 February 2014.

aiaa.org (Global: 7,940^th place; English: 5,176^th place)

aerospaceamerica.aiaa.org

"A year of firsts for electric propulsion". Aerospace America. 1 December 2023. Archived from the original on 11 November 2024. Retrieved 11 November 2024.

archive.org (Global: 6^th place; English: 6^th place)

Seikel, G. R. (1962). Generation of Thrust – Electromagnetic Thrusters. Proceedings of the NASA-University Conference on the Science and Technology of Space Exploration. Vol. 2. Chicago, Illinois. pp. 171–176.

books.google.com (Global: 3^rd place; English: 3^rd place)

Turner, Martin J.L. (2008). Rocket and Spacecraft Propulsion: Principles, Practice and New Developments. Springer Science & Business Media. p. 197. ISBN 978-3-540-69203-4. Retrieved 28 October 2015.

chinanews.com (Global: 1,432^nd place; English: 4,451^st place)

张 (Zhang), 保淑 (Baoshu) (21 June 2021). "配置4台霍尔电推进发动机 "天宫"掀起太空动力变革". 中国新闻网 (in Chinese). Archived from the original on 6 July 2021. Retrieved 18 July 2021.

diva-portal.org (Global: 3,588^th place; English: 3,072^nd place)

ltu.diva-portal.org

"Low–voltage External Discharge Plasma Thruster and Hollow Cathodes Plasma Plume Diagnostics Utilising Electrostatic Probes and Retarding Potential Analyser". Archived from the original on 29 August 2017.

doi.org (Global: 2^nd place; English: 2^nd place)

Choueiri, Edgar Y. (2009). "New Dawn for Electric Rockets". Scientific American. 300 (2): 58–65. Bibcode:2009SciAm.300b..58C. doi:10.1038/scientificamerican0209-58. PMID 19186707.
Morozov, A.I. (March 2003). "The conceptual development of stationary plasma thrusters". Plasma Physics Reports. 29 (3). Nauka/Interperiodica: 235–250. Bibcode:2003PlPhR..29..235M. doi:10.1134/1.1561119. S2CID 122072987.
Shuen-Chen Hwang; Lein, Robert D.; Morgan, Daniel A. (2005). "Noble Gases". Kirk Othmer Encyclopedia of Chemical Technology. Wiley. pp. 343–383. doi:10.1002/0471238961.0701190508230114.a01. ISBN 978-0-471-23896-6.
Goebel, Dan M.; Jorns, Benjamin; Hofer, Richard R.; Mikellides, Ioannis G.; Katz, Ira (2014). "Pole-piece Interactions with the Plasma in a Magnetically Shielded Hall Thruster". 50th AIAA/ASME/SAE/ASEE Joint Propulsion Conference. doi:10.2514/6.2014-3899. ISBN 978-1-62410-303-2.
Karadag, Burak; Cho, Shinatora; Oshio, Yuya; Hamada, Yushi; Funaki, Ikkoh; Komurasaki, Kimiya (2016). "Preliminary Investigation of an External Discharge Plasma Thruster". 52nd AIAA/SAE/ASEE Joint Propulsion Conference. doi:10.2514/6.2016-4951. ISBN 978-1-62410-406-0.
Cornu, Nicolas; Marchandise, Frédéric; Darnon, Franck; Estublier, Denis (2007). PPS1350 Qualification Demonstration: 10500 hrs on the Ground and 5000 hrs in Flight. 43rd AIAA/ASME/SAE/ASEE Joint Propulsion Conference & Exhibit. Cincinnati, Ohio. doi:10.2514/6.2007-5197.

esa.int (Global: 1,482^nd place; English: 1,468^th place)

"Ion engine gets SMART-1 to the Moon: Electric Propulsion Subsystem". ESA. 31 August 2006. Archived from the original on 29 January 2011. Retrieved 25 July 2011.

ghostarchive.org (Global: 32^nd place; English: 21^st place)

Meyer, Mike; et al. (April 2012). "In-space propulsion systems roadmap" (PDF). Archived (PDF) from the original on 9 October 2022.

handle.net (Global: 102^nd place; English: 76^th place)

hdl.handle.net

Hofer, Richard R. (June 2004). Development and Characterization of High-Efficiency, High-Specific Impulse Xenon Hall Thrusters. NASA Technical Reports Server (Report). hdl:2060/20040084644. NASA/CR – 2004-21309.
Polzin, K. A.; Raitses, Y.; Gayoso, J. C.; Fisch, N. J. (25 July 2010). Comparisons in Performance of Electromagnet and Permanent-Magnet Cylindrical Hall-Effect Thrusters. 46th AIAA/ASME/SAE/ASEE Joint Propulsion Conference. NASA Technical Reports Server. hdl:2060/20100035731.
Polzin, K. A.; Raitses, Y.; Merino, E.; Fisch, N. J. (8 December 2008). Preliminary Results of Performance Measurements on a Cylindrical Hall-Effect Thruster with Magnetic Field Generated by Permanent Magnets. 3rd Spacecraft Propulsion Subcommittee (SPS) meeting/JANNAF Interagency Propulsion Committee. NASA Technical Reports Server. hdl:2060/20090014067.

harvard.edu (Global: 18^th place; English: 17^th place)

ui.adsabs.harvard.edu

Choueiri, Edgar Y. (2009). "New Dawn for Electric Rockets". Scientific American. 300 (2): 58–65. Bibcode:2009SciAm.300b..58C. doi:10.1038/scientificamerican0209-58. PMID 19186707.
Morozov, A.I. (March 2003). "The conceptual development of stationary plasma thrusters". Plasma Physics Reports. 29 (3). Nauka/Interperiodica: 235–250. Bibcode:2003PlPhR..29..235M. doi:10.1134/1.1561119. S2CID 122072987.

ieee.org (Global: 652^nd place; English: 515^th place)

spectrum.ieee.org

Jones, Andrew (28 April 2021). "Three Decades in the Making, China's Space Station Launches This Week". IEEE. Archived from the original on 25 December 2024. Retrieved 31 July 2024.

inc42.com (Global: 8,928^th place; English: 4,744^th place)

Gautam, Kushagr (28 May 2021). "Spacetech Startup Bellatrix Aerospace Test Fires India's First Privately Built Hall Thruster". Archived from the original on 18 November 2023. Retrieved 18 November 2023.

indiatimes.com (Global: 17^th place; English: 15^th place)

economictimes.indiatimes.com

"Space startup Bellatrix to test electric propulsion for satellites on-board PSLV". The Economic Times. 21 April 2023. ISSN 0013-0389. Archived from the original on 24 January 2025. Retrieved 17 October 2024.

ippt.gov.pl (Global: low place; English: low place)

fluid.ippt.gov.pl

"Hall thrusters". 14 January 2004. Archived from the original on 28 February 2004.

jaxa.jp (Global: 4,027^th place; English: 6,129^th place)

repository.exst.jaxa.jp

"Numerical Investigation of an External Discharge Hall Thruster Design Utilizing Plasma-lens Magnetic Field" (PDF). Archived (PDF) from the original on 14 August 2017.

lenntech.com (Global: low place; English: low place)

"The elements of the periodic table sorted by ionization energy". www.lenntech.com. Archived from the original on 12 November 2020. Retrieved 28 April 2021.

leonland.de (Global: low place; English: low place)

"Chemical elements by market price". Archived from the original on 24 October 2023. Retrieved 17 September 2023. Using the Reference Price column, as the cost per unit weight values are inconsistent. The table provides dates that appear to be when quotes were obtained, but has links only to generic supplier websites.

nasa.gov (Global: 75^th place; English: 83^rd place)

nasa.gov

Meyer, Mike; et al. (April 2012). "In-space propulsion systems roadmap" (PDF). Archived (PDF) from the original on 9 October 2022.
"NASA, Aerojet Rocketdyne Put Gateway Thruster System to the Test". NASA Glenn. 12 July 2023. Archived from the original on 6 July 2025. Retrieved 17 July 2025.
Sands, Kelly (30 March 2021). "We're Fired Up! Gateway's Propulsion System Passes First Test". NASA. Archived from the original on 25 April 2021. Retrieved 27 April 2021.

jpl.nasa.gov

"Psyche's Hall Thruster". NASA Jet Propulsion Laboratory. Archived from the original on 8 March 2022. Retrieved 8 March 2022.
"Up Close With a Solar Panel on Psyche". NASA Jet Propulsion Laboratory. Retrieved 8 March 2022.

ntrs.nasa.gov

Daniel A. Herman, Todd A. Tofil, Walter Santiago, Hani Kamhawi, James E. Polk, John S. Snyder, Richard R. Hofer, Frank Q. Picha, Jerry Jackson and May Allen. "Overview of the Development and Mission Application of the Advanced Electric Propulsion System (AEPS)" Archived 2 August 2020 at the Wayback Machine (PDF). NASA; NASA/TM–2018-219761. 35th International Electric Propulsion Conference. Atlanta, Georgia, 8–12 October 2017. Retrieved 27 July 2018.

newindianexpress.com (Global: 188^th place; English: 118^th place)

"ISRO to Test Electric Propulsion on Satellites". The New Indian Express. 30 November 2015. Archived from the original on 18 November 2023. Retrieved 17 February 2024.

nih.gov (Global: 4^th place; English: 4^th place)

pubmed.ncbi.nlm.nih.gov

Choueiri, Edgar Y. (2009). "New Dawn for Electric Rockets". Scientific American. 300 (2): 58–65. Bibcode:2009SciAm.300b..58C. doi:10.1038/scientificamerican0209-58. PMID 19186707.

novosti-kosmonavtiki.ru (Global: low place; English: low place)

"Native Electric Propulsion Engines Today" (in Russian). Novosti Kosmonavtiki. 1999. Archived from the original on 6 June 2011.

nro.gov (Global: low place; English: low place)

"National Reconnaissance Office Satellite Successfully Launched" (PDF). Naval Research Laboratory (Press Release). 3 October 1998. Archived (PDF) from the original on 13 November 2011.

permanent.com (Global: low place; English: low place)

"Hall-Effect Stationary Plasma thrusters". Electric Propulsion for Inter-Orbital Vehicles. Archived from the original on 17 July 2013. Retrieved 16 June 2014.[1] Archived 10 October 2007 at the Wayback Machine

popsci.com (Global: 2,941^st place; English: 2,021^st place)

Lewis, Briley (17 October 2023). "NASA's Psyche spacecraft will blaze an unusual blue trail across the solar system". Popular Science. Archived from the original on 17 October 2023. Retrieved 17 October 2023.

pppl.gov (Global: low place; English: low place)

htx.pppl.gov

Raitses, Y.; Fisch, N. J. "Parametric Investigations of a Nonconventional Hall Thruster" (PDF). Physics of Plasmas, 8, 2579 (2001). Archived (PDF) from the original on 27 May 2010.
Smirnov, A.; Raitses, Y.; Fisch, N. J. "Experimental and theoretical studies of cylindrical Hall thrusters" (PDF). Physics of Plasmas 14, 057106 (2007). Archived (PDF) from the original on 27 May 2010.

w3.pppl.gov

"Hall Thruster Project". w3.pppl.gov. Retrieved 28 April 2021.

rocket.com (Global: low place; English: low place)

"Aerojet Rocketdyne's Modified XR-5 Hall Thruster Demonstrates Successful On-Orbit Operation" (Press release). Aerojet Rocketdyne. 1 July 2015. Archived from the original on 9 July 2015. Retrieved 11 October 2016.

sciencedaily.com (Global: 993^rd place; English: 920^th place)

"Krypton Hall effect thruster for spacecraft propulsion". ScienceDaily. Archived from the original on 28 April 2021. Retrieved 28 April 2021.

scmp.com (Global: 362^nd place; English: 245^th place)

Chen, Stephen (2 June 2021). "How China's space station could help power astronauts to Mars". Archived from the original on 22 June 2021. Retrieved 22 June 2021.

semanticscholar.org (Global: 11^th place; English: 8^th place)

api.semanticscholar.org

Morozov, A.I. (March 2003). "The conceptual development of stationary plasma thrusters". Plasma Physics Reports. 29 (3). Nauka/Interperiodica: 235–250. Bibcode:2003PlPhR..29..235M. doi:10.1134/1.1561119. S2CID 122072987.

space.com (Global: 936^th place; English: 713^th place)

"Ion Thruster Prototype Breaks Records in Tests, Could Send Humans to Mars". space.com. 13 October 2017. Archived from the original on 20 March 2018. Retrieved 27 April 2018.

spacenews.com (Global: 1,876^th place; English: 1,225^th place)

Foust, Jeff (28 February 2023). "SpaceX Launches First Upgraded Starlink Satellites". SpaceNews. Retrieved 5 December 2023.
Foust, Jeff (7 May 2019). "Apollo Fusion obtains Hall thruster technology from JPL". Spacenews.com. Retrieved 27 January 2021.
Foust, Jeff (27 January 2021). "Apollo Fusion wins electric propulsion order from York Space Systems". spacenews.com. Retrieved 27 January 2021.

spacex.com (Global: 6,194^th place; English: 5,551^st place)

"Starlink Press Kit" (PDF). SpaceX. 15 May 2019. Archived from the original (PDF) on 15 May 2019. Retrieved 12 November 2019.

umich.edu (Global: 459^th place; English: 360^th place)

pepl.engin.umich.edu

"X3 – Nested Channel Hall Thruster". Plasmadynamics & Electric Propulsion Laboratory, University of Michigan. Archived from the original on 29 April 2021. Retrieved 27 April 2021.

web.archive.org (Global: 1^st place; English: 1^st place)

"Ion Thruster Prototype Breaks Records in Tests, Could Send Humans to Mars". space.com. 13 October 2017. Archived from the original on 20 March 2018. Retrieved 27 April 2018.
"Hall thrusters". 14 January 2004. Archived from the original on 28 February 2004.
"Native Electric Propulsion Engines Today" (in Russian). Novosti Kosmonavtiki. 1999. Archived from the original on 6 June 2011.
"AFIT SPASS Lab Achieves '(AF) Blue Glow'". Air Force Institute of Technology. 13 November 2007. Archived from the original on 22 February 2014.
"A year of firsts for electric propulsion". Aerospace America. 1 December 2023. Archived from the original on 11 November 2024. Retrieved 11 November 2024.
"Aerojet Rocketdyne's Modified XR-5 Hall Thruster Demonstrates Successful On-Orbit Operation" (Press release). Aerojet Rocketdyne. 1 July 2015. Archived from the original on 9 July 2015. Retrieved 11 October 2016.
Lewis, Briley (17 October 2023). "NASA's Psyche spacecraft will blaze an unusual blue trail across the solar system". Popular Science. Archived from the original on 17 October 2023. Retrieved 17 October 2023.
"ISRO to Test Electric Propulsion on Satellites". The New Indian Express. 30 November 2015. Archived from the original on 18 November 2023. Retrieved 17 February 2024.
Gautam, Kushagr (28 May 2021). "Spacetech Startup Bellatrix Aerospace Test Fires India's First Privately Built Hall Thruster". Archived from the original on 18 November 2023. Retrieved 18 November 2023.
"Space startup Bellatrix to test electric propulsion for satellites on-board PSLV". The Economic Times. 21 April 2023. ISSN 0013-0389. Archived from the original on 24 January 2025. Retrieved 17 October 2024.
"Hall-Effect Stationary Plasma thrusters". Electric Propulsion for Inter-Orbital Vehicles. Archived from the original on 17 July 2013. Retrieved 16 June 2014.[1] Archived 10 October 2007 at the Wayback Machine
"Krypton Hall effect thruster for spacecraft propulsion". ScienceDaily. Archived from the original on 28 April 2021. Retrieved 28 April 2021.
"The elements of the periodic table sorted by ionization energy". www.lenntech.com. Archived from the original on 12 November 2020. Retrieved 28 April 2021.
"Starlink Press Kit" (PDF). SpaceX. 15 May 2019. Archived from the original (PDF) on 15 May 2019. Retrieved 12 November 2019.
"Chemical elements by market price". Archived from the original on 24 October 2023. Retrieved 17 September 2023. Using the Reference Price column, as the cost per unit weight values are inconsistent. The table provides dates that appear to be when quotes were obtained, but has links only to generic supplier websites.
Raitses, Y.; Fisch, N. J. "Parametric Investigations of a Nonconventional Hall Thruster" (PDF). Physics of Plasmas, 8, 2579 (2001). Archived (PDF) from the original on 27 May 2010.
Smirnov, A.; Raitses, Y.; Fisch, N. J. "Experimental and theoretical studies of cylindrical Hall thrusters" (PDF). Physics of Plasmas 14, 057106 (2007). Archived (PDF) from the original on 27 May 2010.
"Numerical Investigation of an External Discharge Hall Thruster Design Utilizing Plasma-lens Magnetic Field" (PDF). Archived (PDF) from the original on 14 August 2017.
"Low–voltage External Discharge Plasma Thruster and Hollow Cathodes Plasma Plume Diagnostics Utilising Electrostatic Probes and Retarding Potential Analyser". Archived from the original on 29 August 2017.
"National Reconnaissance Office Satellite Successfully Launched" (PDF). Naval Research Laboratory (Press Release). 3 October 1998. Archived (PDF) from the original on 13 November 2011.
"Ion engine gets SMART-1 to the Moon: Electric Propulsion Subsystem". ESA. 31 August 2006. Archived from the original on 29 January 2011. Retrieved 25 July 2011.
Jones, Andrew (28 April 2021). "Three Decades in the Making, China's Space Station Launches This Week". IEEE. Archived from the original on 25 December 2024. Retrieved 31 July 2024.
Chen, Stephen (2 June 2021). "How China's space station could help power astronauts to Mars". Archived from the original on 22 June 2021. Retrieved 22 June 2021.
张 (Zhang), 保淑 (Baoshu) (21 June 2021). "配置4台霍尔电推进发动机 "天宫"掀起太空动力变革". 中国新闻网 (in Chinese). Archived from the original on 6 July 2021. Retrieved 18 July 2021.
"Psyche's Hall Thruster". NASA Jet Propulsion Laboratory. Archived from the original on 8 March 2022. Retrieved 8 March 2022.
"NASA, Aerojet Rocketdyne Put Gateway Thruster System to the Test". NASA Glenn. 12 July 2023. Archived from the original on 6 July 2025. Retrieved 17 July 2025.
Sands, Kelly (30 March 2021). "We're Fired Up! Gateway's Propulsion System Passes First Test". NASA. Archived from the original on 25 April 2021. Retrieved 27 April 2021.
"X3 – Nested Channel Hall Thruster". Plasmadynamics & Electric Propulsion Laboratory, University of Michigan. Archived from the original on 29 April 2021. Retrieved 27 April 2021.
Daniel A. Herman, Todd A. Tofil, Walter Santiago, Hani Kamhawi, James E. Polk, John S. Snyder, Richard R. Hofer, Frank Q. Picha, Jerry Jackson and May Allen. "Overview of the Development and Mission Application of the Advanced Electric Propulsion System (AEPS)" Archived 2 August 2020 at the Wayback Machine (PDF). NASA; NASA/TM–2018-219761. 35th International Electric Propulsion Conference. Atlanta, Georgia, 8–12 October 2017. Retrieved 27 July 2018.

worldcat.org (Global: 5^th place; English: 5^th place)

search.worldcat.org

"Space startup Bellatrix to test electric propulsion for satellites on-board PSLV". The Economic Times. 21 April 2023. ISSN 0013-0389. Archived from the original on 24 January 2025. Retrieved 17 October 2024.

Hall-effect thruster (English Wikipedia)

afit.edu (Global: low place; English: low place)

aiaa.org (Global: 7,940th place; English: 5,176th place)

aerospaceamerica.aiaa.org

archive.org (Global: 6th place; English: 6th place)

books.google.com (Global: 3rd place; English: 3rd place)

chinanews.com (Global: 1,432nd place; English: 4,451st place)

diva-portal.org (Global: 3,588th place; English: 3,072nd place)

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doi.org (Global: 2nd place; English: 2nd place)

esa.int (Global: 1,482nd place; English: 1,468th place)

ghostarchive.org (Global: 32nd place; English: 21st place)

handle.net (Global: 102nd place; English: 76th place)

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harvard.edu (Global: 18th place; English: 17th place)

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ieee.org (Global: 652nd place; English: 515th place)

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inc42.com (Global: 8,928th place; English: 4,744th place)

indiatimes.com (Global: 17th place; English: 15th place)

economictimes.indiatimes.com

ippt.gov.pl (Global: low place; English: low place)

fluid.ippt.gov.pl

jaxa.jp (Global: 4,027th place; English: 6,129th place)

repository.exst.jaxa.jp

lenntech.com (Global: low place; English: low place)

leonland.de (Global: low place; English: low place)

nasa.gov (Global: 75th place; English: 83rd place)

nasa.gov

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ntrs.nasa.gov

newindianexpress.com (Global: 188th place; English: 118th place)

nih.gov (Global: 4th place; English: 4th place)

pubmed.ncbi.nlm.nih.gov

novosti-kosmonavtiki.ru (Global: low place; English: low place)

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permanent.com (Global: low place; English: low place)

popsci.com (Global: 2,941st place; English: 2,021st place)

pppl.gov (Global: low place; English: low place)

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rocket.com (Global: low place; English: low place)

sciencedaily.com (Global: 993rd place; English: 920th place)

scmp.com (Global: 362nd place; English: 245th place)

semanticscholar.org (Global: 11th place; English: 8th place)

api.semanticscholar.org

space.com (Global: 936th place; English: 713th place)

spacenews.com (Global: 1,876th place; English: 1,225th place)

spacex.com (Global: 6,194th place; English: 5,551st place)

umich.edu (Global: 459th place; English: 360th place)

pepl.engin.umich.edu

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worldcat.org (Global: 5th place; English: 5th place)

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aiaa.org (Global: 7,940^th place; English: 5,176^th place)

archive.org (Global: 6^th place; English: 6^th place)

books.google.com (Global: 3^rd place; English: 3^rd place)

chinanews.com (Global: 1,432^nd place; English: 4,451^st place)

diva-portal.org (Global: 3,588^th place; English: 3,072^nd place)

doi.org (Global: 2^nd place; English: 2^nd place)

esa.int (Global: 1,482^nd place; English: 1,468^th place)

ghostarchive.org (Global: 32^nd place; English: 21^st place)

handle.net (Global: 102^nd place; English: 76^th place)

harvard.edu (Global: 18^th place; English: 17^th place)

ieee.org (Global: 652^nd place; English: 515^th place)

inc42.com (Global: 8,928^th place; English: 4,744^th place)

indiatimes.com (Global: 17^th place; English: 15^th place)

jaxa.jp (Global: 4,027^th place; English: 6,129^th place)

nasa.gov (Global: 75^th place; English: 83^rd place)

newindianexpress.com (Global: 188^th place; English: 118^th place)

nih.gov (Global: 4^th place; English: 4^th place)

popsci.com (Global: 2,941^st place; English: 2,021^st place)

sciencedaily.com (Global: 993^rd place; English: 920^th place)

scmp.com (Global: 362^nd place; English: 245^th place)

semanticscholar.org (Global: 11^th place; English: 8^th place)

space.com (Global: 936^th place; English: 713^th place)

spacenews.com (Global: 1,876^th place; English: 1,225^th place)

spacex.com (Global: 6,194^th place; English: 5,551^st place)

umich.edu (Global: 459^th place; English: 360^th place)

web.archive.org (Global: 1^st place; English: 1^st place)

worldcat.org (Global: 5^th place; English: 5^th place)