Helix Nebula (English Wikipedia)

Analysis of information sources in references of the Wikipedia article "Helix Nebula" in English language version.

refsWebsite

Global rank English rank

16harvard.edu

18^th place

17^th place

15doi.org

2^nd place

10arxiv.org

69^th place

59^th place

6semanticscholar.org

11^th place

8^th place

4worldcat.org

5^th place

3iop.org

1,725^th place

1,828^th place

2u-strasbg.fr

1,342^nd place

1,819^th place

2web.archive.org

1^st place

1snopes.com

944^th place

678^th place

1skyandtelescope.com

8,316^th place

7,545^th place

1universetoday.com

3,691^st place

3,233^rd place

1nasa.gov

75^th place

83^rd place

1handle.net

102^nd place

76^th place

arxiv.org (Global: 69^th place; English: 59^th place)

O'Dell, C. R.; McCullough, Peter R.; Meixner, Margaret (2004). "Unraveling the Helix Nebula: Its Structure and Knots". The Astronomical Journal. 128 (5): 2339–2356. arXiv:astro-ph/0407556. Bibcode:2004AJ....128.2339O. doi:10.1086/424621. S2CID 119507454.
Hora, Joseph L.; Latter, William B.; Smith, Howard A.; Marengo, Massimo (2006). "Infrared Observations of the Helix Planetary Nebula". The Astrophysical Journal. 652 (1): 426–441. arXiv:astro-ph/0607541. Bibcode:2006ApJ...652..426H. doi:10.1086/507944. S2CID 15427995.
Su, K. Y. L.; Chu, Y.-H.; Rieke, G. H.; Huggins, P. J.; et al. (March 2007). "A Debris Disk around the Central Star of the Helix Nebula?". The Astrophysical Journal. 700 (2): L41 – L45. arXiv:astro-ph/0702296. Bibcode:2007ApJ...657L..41S. doi:10.1086/513018. S2CID 15244406.
Henry, R. B. C.; Kwitter, K. B.; Dufour, R. J. (June 1999). "Morphology and Composition of the Helix Nebula". The Astrophysical Journal. 517 (2): 782–798. arXiv:astro-ph/9901060. Bibcode:1999ApJ...517..782H. doi:10.1086/307215. ISSN 0004-637X.
Matsuura, M.; Speck, A. K.; McHunu, B. M.; Tanaka, I.; Wright, N. J.; Smith, M. D.; Zijlstra, A. A.; Viti, S.; Wesson, R. (2009-08-01). "A "Firework" of H2Knots in the Planetary Nebula NGC 7293 (The Helix Nebula)". The Astrophysical Journal. 700 (2): 1067–1077. arXiv:0906.2870. Bibcode:2009ApJ...700.1067M. doi:10.1088/0004-637X/700/2/1067. hdl:10355/5140. ISSN 0004-637X. S2CID 119252556.
Matsuura, M.; Speck, A. K.; Smith, M. D.; Zijlstra, A. A.; et al. (December 2007). "VLT/near-infrared integral field spectrometer observations of molecular hydrogen lines in the knots of the planetary nebula NGC 7293 (the Helix Nebula)". Monthly Notices of the Royal Astronomical Society. 382 (4): 1447–1459. arXiv:0709.3065. Bibcode:2007MNRAS.382.1447M. doi:10.1111/j.1365-2966.2007.12496.x. S2CID 118514953.
Iskandarli, Leyla; Farihi, Jay; et al. (October 2024). "Novel Constraints on Companions to the Helix Nebula Central Star". Monthly Notices of the Royal Astronomical Society. 534 (4): 3498–3505. arXiv:2410.03288. Bibcode:2024MNRAS.534.3498I. doi:10.1093/mnras/stae2286.
Su, K. Y. L.; Chu, Y. -H.; Rieke, G. H.; Huggins, P. J.; Gruendl, R.; Napiwotzki, R.; Rauch, T.; Latter, W. B.; Volk, K. (2007-03-01). "A Debris Disk around the Central Star of the Helix Nebula?". The Astrophysical Journal. 657 (1): L41 – L45. arXiv:astro-ph/0702296. Bibcode:2007ApJ...657L..41S. doi:10.1086/513018. ISSN 0004-637X.
Marshall, Jonathan P.; Ertel, Steve; Birtcil, Eric; Villaver, Eva; Kemper, Francisca; Boffin, Henri; Scicluna, Peter; Kamath, Devika (2023-01-01). "Evidence for the Disruption of a Planetary System During the Formation of the Helix Nebula". The Astronomical Journal. 165 (1): 22. arXiv:2211.02251. Bibcode:2023AJ....165...22M. doi:10.3847/1538-3881/ac9d90. ISSN 0004-6256.
Estrada-Dorado, S.; Guerrero, M. A.; Toalá, J. A.; Maldonado, R. F.; Lora, V.; Vasquez-Torres, D. A.; Chu, Y. -H. (2024). "Accretion onto WD 2226$-$210, the central star of the Helix Nebula". Monthly Notices of the Royal Astronomical Society. 536 (3): 2477. arXiv:2412.07863. Bibcode:2025MNRAS.536.2477E. doi:10.1093/mnras/stae2733.

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

O'Dell, C. R.; McCullough, Peter R.; Meixner, Margaret (2004). "Unraveling the Helix Nebula: Its Structure and Knots". The Astronomical Journal. 128 (5): 2339–2356. arXiv:astro-ph/0407556. Bibcode:2004AJ....128.2339O. doi:10.1086/424621. S2CID 119507454.
Hora, Joseph L.; Latter, William B.; Smith, Howard A.; Marengo, Massimo (2006). "Infrared Observations of the Helix Planetary Nebula". The Astrophysical Journal. 652 (1): 426–441. arXiv:astro-ph/0607541. Bibcode:2006ApJ...652..426H. doi:10.1086/507944. S2CID 15427995.
O'Dell, C. R.; Balick, B.; Hajian, A. R.; Henney, W. J.; et al. (2002). "Knots in Nearby Planetary Nebulae". The Astronomical Journal. 123 (6): 3329–3347. Bibcode:2002AJ....123.3329O. doi:10.1086/340726.
Young, K.; Cox, P.; Huggins, P. J.; Forveille, T.; Bachiller, R. (1999). "The Molecular Envelope of the Helix Nebula". The Astrophysical Journal. 522 (1): 387–396. Bibcode:1999ApJ...522..387Y. doi:10.1086/307639.
Su, K. Y. L.; Chu, Y.-H.; Rieke, G. H.; Huggins, P. J.; et al. (March 2007). "A Debris Disk around the Central Star of the Helix Nebula?". The Astrophysical Journal. 700 (2): L41 – L45. arXiv:astro-ph/0702296. Bibcode:2007ApJ...657L..41S. doi:10.1086/513018. S2CID 15244406.
Henry, R. B. C.; Kwitter, K. B.; Dufour, R. J. (June 1999). "Morphology and Composition of the Helix Nebula". The Astrophysical Journal. 517 (2): 782–798. arXiv:astro-ph/9901060. Bibcode:1999ApJ...517..782H. doi:10.1086/307215. ISSN 0004-637X.
O’Dell, C. R.; Balick, B.; Hajian, A. R.; Henney, W. J.; Burkert, A. (June 2002). "Knots in Nearby Planetary Nebulae". The Astronomical Journal. 123 (6): 3329–3347. Bibcode:2002AJ....123.3329O. doi:10.1086/340726.
Huggins, Patrick; Bachiller, Rafael; Cox, Pierre; Forveille, Thierry (1992). "CO in the globules of the Helix nebula". The Astrophysical Journal Letters. 401: L43 – L46. Bibcode:1992ApJ...401L..43H. doi:10.1086/186666.
Matsuura, M.; Speck, A. K.; McHunu, B. M.; Tanaka, I.; Wright, N. J.; Smith, M. D.; Zijlstra, A. A.; Viti, S.; Wesson, R. (2009-08-01). "A "Firework" of H2Knots in the Planetary Nebula NGC 7293 (The Helix Nebula)". The Astrophysical Journal. 700 (2): 1067–1077. arXiv:0906.2870. Bibcode:2009ApJ...700.1067M. doi:10.1088/0004-637X/700/2/1067. hdl:10355/5140. ISSN 0004-637X. S2CID 119252556.
Capriotti, Eugene R.; Kendall, Anothony D. (10 May 2006). "The Origin and Physical Properties of the Cometary Knots in NGC 7293". The Astrophysical Journal. 642 (2): 923–932. Bibcode:2006ApJ...642..923C. doi:10.1086/501226. S2CID 120347309.
Matsuura, M.; Speck, A. K.; Smith, M. D.; Zijlstra, A. A.; et al. (December 2007). "VLT/near-infrared integral field spectrometer observations of molecular hydrogen lines in the knots of the planetary nebula NGC 7293 (the Helix Nebula)". Monthly Notices of the Royal Astronomical Society. 382 (4): 1447–1459. arXiv:0709.3065. Bibcode:2007MNRAS.382.1447M. doi:10.1111/j.1365-2966.2007.12496.x. S2CID 118514953.
Iskandarli, Leyla; Farihi, Jay; et al. (October 2024). "Novel Constraints on Companions to the Helix Nebula Central Star". Monthly Notices of the Royal Astronomical Society. 534 (4): 3498–3505. arXiv:2410.03288. Bibcode:2024MNRAS.534.3498I. doi:10.1093/mnras/stae2286.
Su, K. Y. L.; Chu, Y. -H.; Rieke, G. H.; Huggins, P. J.; Gruendl, R.; Napiwotzki, R.; Rauch, T.; Latter, W. B.; Volk, K. (2007-03-01). "A Debris Disk around the Central Star of the Helix Nebula?". The Astrophysical Journal. 657 (1): L41 – L45. arXiv:astro-ph/0702296. Bibcode:2007ApJ...657L..41S. doi:10.1086/513018. ISSN 0004-637X.
Marshall, Jonathan P.; Ertel, Steve; Birtcil, Eric; Villaver, Eva; Kemper, Francisca; Boffin, Henri; Scicluna, Peter; Kamath, Devika (2023-01-01). "Evidence for the Disruption of a Planetary System During the Formation of the Helix Nebula". The Astronomical Journal. 165 (1): 22. arXiv:2211.02251. Bibcode:2023AJ....165...22M. doi:10.3847/1538-3881/ac9d90. ISSN 0004-6256.
Estrada-Dorado, S.; Guerrero, M. A.; Toalá, J. A.; Maldonado, R. F.; Lora, V.; Vasquez-Torres, D. A.; Chu, Y. -H. (2024). "Accretion onto WD 2226$-$210, the central star of the Helix Nebula". Monthly Notices of the Royal Astronomical Society. 536 (3): 2477. arXiv:2412.07863. Bibcode:2025MNRAS.536.2477E. doi:10.1093/mnras/stae2733.

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

hdl.handle.net

Matsuura, M.; Speck, A. K.; McHunu, B. M.; Tanaka, I.; Wright, N. J.; Smith, M. D.; Zijlstra, A. A.; Viti, S.; Wesson, R. (2009-08-01). "A "Firework" of H2Knots in the Planetary Nebula NGC 7293 (The Helix Nebula)". The Astrophysical Journal. 700 (2): 1067–1077. arXiv:0906.2870. Bibcode:2009ApJ...700.1067M. doi:10.1088/0004-637X/700/2/1067. hdl:10355/5140. ISSN 0004-637X. S2CID 119252556.

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

ui.adsabs.harvard.edu

O'Dell, C. R.; McCullough, Peter R.; Meixner, Margaret (2004). "Unraveling the Helix Nebula: Its Structure and Knots". The Astronomical Journal. 128 (5): 2339–2356. arXiv:astro-ph/0407556. Bibcode:2004AJ....128.2339O. doi:10.1086/424621. S2CID 119507454.
Hora, Joseph L.; Latter, William B.; Smith, Howard A.; Marengo, Massimo (2006). "Infrared Observations of the Helix Planetary Nebula". The Astrophysical Journal. 652 (1): 426–441. arXiv:astro-ph/0607541. Bibcode:2006ApJ...652..426H. doi:10.1086/507944. S2CID 15427995.
O'Dell, C. R.; Balick, B.; Hajian, A. R.; Henney, W. J.; et al. (2002). "Knots in Nearby Planetary Nebulae". The Astronomical Journal. 123 (6): 3329–3347. Bibcode:2002AJ....123.3329O. doi:10.1086/340726.
Young, K.; Cox, P.; Huggins, P. J.; Forveille, T.; Bachiller, R. (1999). "The Molecular Envelope of the Helix Nebula". The Astrophysical Journal. 522 (1): 387–396. Bibcode:1999ApJ...522..387Y. doi:10.1086/307639.
Su, K. Y. L.; Chu, Y.-H.; Rieke, G. H.; Huggins, P. J.; et al. (March 2007). "A Debris Disk around the Central Star of the Helix Nebula?". The Astrophysical Journal. 700 (2): L41 – L45. arXiv:astro-ph/0702296. Bibcode:2007ApJ...657L..41S. doi:10.1086/513018. S2CID 15244406.
Henry, R. B. C.; Kwitter, K. B.; Dufour, R. J. (June 1999). "Morphology and Composition of the Helix Nebula". The Astrophysical Journal. 517 (2): 782–798. arXiv:astro-ph/9901060. Bibcode:1999ApJ...517..782H. doi:10.1086/307215. ISSN 0004-637X.
O’Dell, C. R.; Balick, B.; Hajian, A. R.; Henney, W. J.; Burkert, A. (June 2002). "Knots in Nearby Planetary Nebulae". The Astronomical Journal. 123 (6): 3329–3347. Bibcode:2002AJ....123.3329O. doi:10.1086/340726.
Huggins, Patrick; Bachiller, Rafael; Cox, Pierre; Forveille, Thierry (1992). "CO in the globules of the Helix nebula". The Astrophysical Journal Letters. 401: L43 – L46. Bibcode:1992ApJ...401L..43H. doi:10.1086/186666.
O'Dell, C. R.; Balick, B.; Hajian, A. R.; Henney, W. J.; et al. (2003). "Knots in Planetary Nebulae". In Arthur, Jane; Henney, William (eds.). Winds, Bubbles, and Explosions: A Conference to Honor John Dyson, Pátzcuaro, Michoacán, México, September 9–13, 2002. Revista Mexicana de Astronomía y Astrofísica, Serie de Conferencias. Vol. 15. Instituto de Astronomía, Universidad Nacional Autónoma de México. pp. 29–33. Bibcode:2003RMxAC..15...29O.
Matsuura, M.; Speck, A. K.; McHunu, B. M.; Tanaka, I.; Wright, N. J.; Smith, M. D.; Zijlstra, A. A.; Viti, S.; Wesson, R. (2009-08-01). "A "Firework" of H2Knots in the Planetary Nebula NGC 7293 (The Helix Nebula)". The Astrophysical Journal. 700 (2): 1067–1077. arXiv:0906.2870. Bibcode:2009ApJ...700.1067M. doi:10.1088/0004-637X/700/2/1067. hdl:10355/5140. ISSN 0004-637X. S2CID 119252556.
Capriotti, Eugene R.; Kendall, Anothony D. (10 May 2006). "The Origin and Physical Properties of the Cometary Knots in NGC 7293". The Astrophysical Journal. 642 (2): 923–932. Bibcode:2006ApJ...642..923C. doi:10.1086/501226. S2CID 120347309.
Matsuura, M.; Speck, A. K.; Smith, M. D.; Zijlstra, A. A.; et al. (December 2007). "VLT/near-infrared integral field spectrometer observations of molecular hydrogen lines in the knots of the planetary nebula NGC 7293 (the Helix Nebula)". Monthly Notices of the Royal Astronomical Society. 382 (4): 1447–1459. arXiv:0709.3065. Bibcode:2007MNRAS.382.1447M. doi:10.1111/j.1365-2966.2007.12496.x. S2CID 118514953.
Iskandarli, Leyla; Farihi, Jay; et al. (October 2024). "Novel Constraints on Companions to the Helix Nebula Central Star". Monthly Notices of the Royal Astronomical Society. 534 (4): 3498–3505. arXiv:2410.03288. Bibcode:2024MNRAS.534.3498I. doi:10.1093/mnras/stae2286.
Su, K. Y. L.; Chu, Y. -H.; Rieke, G. H.; Huggins, P. J.; Gruendl, R.; Napiwotzki, R.; Rauch, T.; Latter, W. B.; Volk, K. (2007-03-01). "A Debris Disk around the Central Star of the Helix Nebula?". The Astrophysical Journal. 657 (1): L41 – L45. arXiv:astro-ph/0702296. Bibcode:2007ApJ...657L..41S. doi:10.1086/513018. ISSN 0004-637X.
Marshall, Jonathan P.; Ertel, Steve; Birtcil, Eric; Villaver, Eva; Kemper, Francisca; Boffin, Henri; Scicluna, Peter; Kamath, Devika (2023-01-01). "Evidence for the Disruption of a Planetary System During the Formation of the Helix Nebula". The Astronomical Journal. 165 (1): 22. arXiv:2211.02251. Bibcode:2023AJ....165...22M. doi:10.3847/1538-3881/ac9d90. ISSN 0004-6256.
Estrada-Dorado, S.; Guerrero, M. A.; Toalá, J. A.; Maldonado, R. F.; Lora, V.; Vasquez-Torres, D. A.; Chu, Y. -H. (2024). "Accretion onto WD 2226$-$210, the central star of the Helix Nebula". Monthly Notices of the Royal Astronomical Society. 536 (3): 2477. arXiv:2412.07863. Bibcode:2025MNRAS.536.2477E. doi:10.1093/mnras/stae2733.

iop.org (Global: 1,725^th place; English: 1,828^th place)

stacks.iop.org

Henry, R. B. C.; Kwitter, K. B.; Dufour, R. J. (June 1999). "Morphology and Composition of the Helix Nebula". The Astrophysical Journal. 517 (2): 782–798. arXiv:astro-ph/9901060. Bibcode:1999ApJ...517..782H. doi:10.1086/307215. ISSN 0004-637X.
O’Dell, C. R.; Balick, B.; Hajian, A. R.; Henney, W. J.; Burkert, A. (June 2002). "Knots in Nearby Planetary Nebulae". The Astronomical Journal. 123 (6): 3329–3347. Bibcode:2002AJ....123.3329O. doi:10.1086/340726.
Matsuura, M.; Speck, A. K.; McHunu, B. M.; Tanaka, I.; Wright, N. J.; Smith, M. D.; Zijlstra, A. A.; Viti, S.; Wesson, R. (2009-08-01). "A "Firework" of H2Knots in the Planetary Nebula NGC 7293 (The Helix Nebula)". The Astrophysical Journal. 700 (2): 1067–1077. arXiv:0906.2870. Bibcode:2009ApJ...700.1067M. doi:10.1088/0004-637X/700/2/1067. hdl:10355/5140. ISSN 0004-637X. S2CID 119252556.

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

apod.nasa.gov

"APOD: 2008 April 13 - Curious Cometary Knots in the Helix Nebula". apod.nasa.gov. Archived from the original on 2012-05-05.

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

api.semanticscholar.org

O'Dell, C. R.; McCullough, Peter R.; Meixner, Margaret (2004). "Unraveling the Helix Nebula: Its Structure and Knots". The Astronomical Journal. 128 (5): 2339–2356. arXiv:astro-ph/0407556. Bibcode:2004AJ....128.2339O. doi:10.1086/424621. S2CID 119507454.
Hora, Joseph L.; Latter, William B.; Smith, Howard A.; Marengo, Massimo (2006). "Infrared Observations of the Helix Planetary Nebula". The Astrophysical Journal. 652 (1): 426–441. arXiv:astro-ph/0607541. Bibcode:2006ApJ...652..426H. doi:10.1086/507944. S2CID 15427995.
Su, K. Y. L.; Chu, Y.-H.; Rieke, G. H.; Huggins, P. J.; et al. (March 2007). "A Debris Disk around the Central Star of the Helix Nebula?". The Astrophysical Journal. 700 (2): L41 – L45. arXiv:astro-ph/0702296. Bibcode:2007ApJ...657L..41S. doi:10.1086/513018. S2CID 15244406.
Matsuura, M.; Speck, A. K.; McHunu, B. M.; Tanaka, I.; Wright, N. J.; Smith, M. D.; Zijlstra, A. A.; Viti, S.; Wesson, R. (2009-08-01). "A "Firework" of H2Knots in the Planetary Nebula NGC 7293 (The Helix Nebula)". The Astrophysical Journal. 700 (2): 1067–1077. arXiv:0906.2870. Bibcode:2009ApJ...700.1067M. doi:10.1088/0004-637X/700/2/1067. hdl:10355/5140. ISSN 0004-637X. S2CID 119252556.
Capriotti, Eugene R.; Kendall, Anothony D. (10 May 2006). "The Origin and Physical Properties of the Cometary Knots in NGC 7293". The Astrophysical Journal. 642 (2): 923–932. Bibcode:2006ApJ...642..923C. doi:10.1086/501226. S2CID 120347309.
Matsuura, M.; Speck, A. K.; Smith, M. D.; Zijlstra, A. A.; et al. (December 2007). "VLT/near-infrared integral field spectrometer observations of molecular hydrogen lines in the knots of the planetary nebula NGC 7293 (the Helix Nebula)". Monthly Notices of the Royal Astronomical Society. 382 (4): 1447–1459. arXiv:0709.3065. Bibcode:2007MNRAS.382.1447M. doi:10.1111/j.1365-2966.2007.12496.x. S2CID 118514953.

skyandtelescope.com (Global: 8,316^th place; English: 7,545^th place)

"The Eye of Sauron (aka NGC7293)". Sky and Telescope.

snopes.com (Global: 944^th place; English: 678^th place)

"Urban Legends Reference Pages". The Eye of God. 5 February 2004. Retrieved 2007-07-16.

u-strasbg.fr (Global: 1,342^nd place; English: 1,819^th place)

simbad.u-strasbg.fr

"NGC 7293". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2006-12-07.
"SIMBAD references".

universetoday.com (Global: 3,691^st place; English: 3,233^rd place)

Nancy Atkinson (4 October 2012). "Eye-Like Helix Nebula Turns Blue in New Image". Universe Today. Archived from the original on 14 July 2014.

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

Nancy Atkinson (4 October 2012). "Eye-Like Helix Nebula Turns Blue in New Image". Universe Today. Archived from the original on 14 July 2014.
"APOD: 2008 April 13 - Curious Cometary Knots in the Helix Nebula". apod.nasa.gov. Archived from the original on 2012-05-05.

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

search.worldcat.org

Henry, R. B. C.; Kwitter, K. B.; Dufour, R. J. (June 1999). "Morphology and Composition of the Helix Nebula". The Astrophysical Journal. 517 (2): 782–798. arXiv:astro-ph/9901060. Bibcode:1999ApJ...517..782H. doi:10.1086/307215. ISSN 0004-637X.
Matsuura, M.; Speck, A. K.; McHunu, B. M.; Tanaka, I.; Wright, N. J.; Smith, M. D.; Zijlstra, A. A.; Viti, S.; Wesson, R. (2009-08-01). "A "Firework" of H2Knots in the Planetary Nebula NGC 7293 (The Helix Nebula)". The Astrophysical Journal. 700 (2): 1067–1077. arXiv:0906.2870. Bibcode:2009ApJ...700.1067M. doi:10.1088/0004-637X/700/2/1067. hdl:10355/5140. ISSN 0004-637X. S2CID 119252556.
Su, K. Y. L.; Chu, Y. -H.; Rieke, G. H.; Huggins, P. J.; Gruendl, R.; Napiwotzki, R.; Rauch, T.; Latter, W. B.; Volk, K. (2007-03-01). "A Debris Disk around the Central Star of the Helix Nebula?". The Astrophysical Journal. 657 (1): L41 – L45. arXiv:astro-ph/0702296. Bibcode:2007ApJ...657L..41S. doi:10.1086/513018. ISSN 0004-637X.
Marshall, Jonathan P.; Ertel, Steve; Birtcil, Eric; Villaver, Eva; Kemper, Francisca; Boffin, Henri; Scicluna, Peter; Kamath, Devika (2023-01-01). "Evidence for the Disruption of a Planetary System During the Formation of the Helix Nebula". The Astronomical Journal. 165 (1): 22. arXiv:2211.02251. Bibcode:2023AJ....165...22M. doi:10.3847/1538-3881/ac9d90. ISSN 0004-6256.

Helix Nebula (English Wikipedia)

arxiv.org (Global: 69th place; English: 59th place)

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

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

hdl.handle.net

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

ui.adsabs.harvard.edu

iop.org (Global: 1,725th place; English: 1,828th place)

stacks.iop.org

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