«30 Cygni – Variable Star». SIMBAD Astronomical Database. Centre de Données astronomiques de Strasbourg. Arxivat de l'original el 14 December 2012. [Consulta: 31 December 2013].
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Zdziarski, A. A.; Mikolajewska, J.; Belczynski, K. «Cyg X-3: A low-mass black hole or a neutron star». Monthly Notices of the Royal Astronomical Society: Letters, vol. 429, 2012, pàg. L104–L108. arXiv: 1208.5455. Bibcode: 2013MNRAS.429L.104Z. DOI: 10.1093/mnrasl/sls035.
Nowak, M. A.; Heinz, S.; Begelman, M. C. «Hiding in Plain Sight:ChandraObservations of the Quiescent Neutron Star 4U 2129+47 in Eclipse». The Astrophysical Journal, vol. 573, 2, 2002, pàg. 778. arXiv: astro-ph/0204503. Bibcode: 2002ApJ...573..778N. DOI: 10.1086/340757.
De Beck, E.; Decin, L.; de Koter, A.; Justtanont, K.; Verhoelst, T.; Kemper, F.; Menten, K. M. «Probing the mass-loss history of AGB and red supergiant stars from CO rotational line profiles». Astronomy & Astrophysics, vol. 523, November 2010, pàg. A18. arXiv: 1008.1083. Bibcode: 2010A&A...523A..18D. DOI: 10.1051/0004-6361/200913771. ISSN: 0004-6361.
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Lissauer, Jack J.; Fabrycky, Daniel C.; Ford, Eric B.; Borucki, William J.; Fressin, Francois; Marcy, Geoffrey W.; Orosz, Jerome A.; Rowe, Jason F.; Torres, Guillermo «A closely packed system of low-mass, low-density planets transiting Kepler-11». Nature, vol. 470, 7332, 2011, pàg. 53–58. arXiv: 1102.0291. Bibcode: 2011Natur.470...53L. DOI: 10.1038/nature09760. PMID: 21293371.
Lissauer, Jack J.; Jontof-Hutter, Daniel; Rowe, Jason F.; Fabrycky, Daniel C.; Lopez, Eric D.; Agol, Eric; Marcy, Geoffrey W.; Deck, Katherine M.; Fischer, Debra A. «All Six Planets Known to Orbit Kepler-11 Have Low Densities». The Astrophysical Journal, vol. 770, 2, 2013. arXiv: 1303.0227. Bibcode: 2013ApJ...770..131L. DOI: 10.1088/0004-637X/770/2/131.
Raghavan; Henry, Todd J.; Mason, Brian D.; Subasavage, John P.; Jao, Wei‐Chun; Beaulieu, Thom D.; Hambly, Nigel C. «Two Suns in The Sky: Stellar Multiplicity in Exoplanet Systems». The Astrophysical Journal, vol. 646, 1, 2006, pàg. 523–542. arXiv: astro-ph/0603836. Bibcode: 2006ApJ...646..523R. DOI: 10.1086/504823.
Naef, D.; Mayor, M.; Korzennik, S. G.; Queloz, D.; Udry, S.; Nisenson, P.; Noyes, R. W.; Brown, T. M.; Beuzit, J. L. «The ELODIE survey for northern extra-solar planets II. A Jovian planet on a long-period orbit around GJ 777 A». Astronomy and Astrophysics, vol. 410, 3, 2003, pàg. 1051–1054. arXiv: astro-ph/0306586. Bibcode: 2003A&A...410.1051N. DOI: 10.1051/0004-6361:20031341.
Kim, J. S.; Kim, S. W.; Kurayama, T.; Honma, M.; Sasao, T.; Kim, S. J. «Vlbi Observation of Microquasar Cyg X-3 During an X-Ray State Transition from Soft to Hard in the 2007 May-June Flare». The Astrophysical Journal, vol. 772, 1, 2013, pàg. 41. arXiv: 1307.1226. Bibcode: 2013ApJ...772...41K. DOI: 10.1088/0004-637X/772/1/41.
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Zdziarski, A. A.; Mikolajewska, J.; Belczynski, K. «Cyg X-3: A low-mass black hole or a neutron star». Monthly Notices of the Royal Astronomical Society: Letters, vol. 429, 2012, pàg. L104–L108. arXiv: 1208.5455. Bibcode: 2013MNRAS.429L.104Z. DOI: 10.1093/mnrasl/sls035.
Crampton, D.; Cowley, A. P. «Confirmation of a 9.8-day period of Cygnus X-2». Publications of the Astronomical Society of the Pacific, vol. 92, 1980, pàg. 147. Bibcode: 1980PASP...92..147C. DOI: 10.1086/130636.
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Nowak, M. A.; Heinz, S.; Begelman, M. C. «Hiding in Plain Sight:ChandraObservations of the Quiescent Neutron Star 4U 2129+47 in Eclipse». The Astrophysical Journal, vol. 573, 2, 2002, pàg. 778. arXiv: astro-ph/0204503. Bibcode: 2002ApJ...573..778N. DOI: 10.1086/340757.
De Beck, E.; Decin, L.; de Koter, A.; Justtanont, K.; Verhoelst, T.; Kemper, F.; Menten, K. M. «Probing the mass-loss history of AGB and red supergiant stars from CO rotational line profiles». Astronomy & Astrophysics, vol. 523, November 2010, pàg. A18. arXiv: 1008.1083. Bibcode: 2010A&A...523A..18D. DOI: 10.1051/0004-6361/200913771. ISSN: 0004-6361.
Schuster, M. T.; Marengo, M.; Hora, J. L.; Fazio, G. G.; Humphreys, R. M.; Gehrz, R. D.; Hinz, P. M.; Kenworthy, M. A.; Hoffmann, W. F. «Imaging the Cool Hypergiant NML Cygni's Dusty Circumstellar Envelope with Adaptive Optics». The Astrophysical Journal, vol. 699, 2, 2009, pàg. 1423–1432. arXiv: 0904.4690. Bibcode: 2009ApJ...699.1423S. DOI: 10.1088/0004-637X/699/2/1423.
Lissauer, Jack J.; Fabrycky, Daniel C.; Ford, Eric B.; Borucki, William J.; Fressin, Francois; Marcy, Geoffrey W.; Orosz, Jerome A.; Rowe, Jason F.; Torres, Guillermo «A closely packed system of low-mass, low-density planets transiting Kepler-11». Nature, vol. 470, 7332, 2011, pàg. 53–58. arXiv: 1102.0291. Bibcode: 2011Natur.470...53L. DOI: 10.1038/nature09760. PMID: 21293371.
Lissauer, Jack J.; Jontof-Hutter, Daniel; Rowe, Jason F.; Fabrycky, Daniel C.; Lopez, Eric D.; Agol, Eric; Marcy, Geoffrey W.; Deck, Katherine M.; Fischer, Debra A. «All Six Planets Known to Orbit Kepler-11 Have Low Densities». The Astrophysical Journal, vol. 770, 2, 2013. arXiv: 1303.0227. Bibcode: 2013ApJ...770..131L. DOI: 10.1088/0004-637X/770/2/131.
Raghavan; Henry, Todd J.; Mason, Brian D.; Subasavage, John P.; Jao, Wei‐Chun; Beaulieu, Thom D.; Hambly, Nigel C. «Two Suns in The Sky: Stellar Multiplicity in Exoplanet Systems». The Astrophysical Journal, vol. 646, 1, 2006, pàg. 523–542. arXiv: astro-ph/0603836. Bibcode: 2006ApJ...646..523R. DOI: 10.1086/504823.
Naef, D.; Mayor, M.; Korzennik, S. G.; Queloz, D.; Udry, S.; Nisenson, P.; Noyes, R. W.; Brown, T. M.; Beuzit, J. L. «The ELODIE survey for northern extra-solar planets II. A Jovian planet on a long-period orbit around GJ 777 A». Astronomy and Astrophysics, vol. 410, 3, 2003, pàg. 1051–1054. arXiv: astro-ph/0306586. Bibcode: 2003A&A...410.1051N. DOI: 10.1051/0004-6361:20031341.
Kim, J. S.; Kim, S. W.; Kurayama, T.; Honma, M.; Sasao, T.; Kim, S. J. «Vlbi Observation of Microquasar Cyg X-3 During an X-Ray State Transition from Soft to Hard in the 2007 May-June Flare». The Astrophysical Journal, vol. 772, 1, 2013, pàg. 41. arXiv: 1307.1226. Bibcode: 2013ApJ...772...41K. DOI: 10.1088/0004-637X/772/1/41.
Becker, R. H.; Robinson-Saba, J. L.; Pravdo, S. H.; Boldt, E. A.; Holt, S. S.; Serlemitsos, P. J.; Swank, J. H. «A 4.8-hour periodicity in the spectra of Cygnus X-3». The Astrophysical Journal, vol. 224, 1978, pàg. L113. Bibcode: 1978ApJ...224L.113B. DOI: 10.1086/182772.
Zdziarski, A. A.; Mikolajewska, J.; Belczynski, K. «Cyg X-3: A low-mass black hole or a neutron star». Monthly Notices of the Royal Astronomical Society: Letters, vol. 429, 2012, pàg. L104–L108. arXiv: 1208.5455. Bibcode: 2013MNRAS.429L.104Z. DOI: 10.1093/mnrasl/sls035.
Crampton, D.; Cowley, A. P. «Confirmation of a 9.8-day period of Cygnus X-2». Publications of the Astronomical Society of the Pacific, vol. 92, 1980, pàg. 147. Bibcode: 1980PASP...92..147C. DOI: 10.1086/130636.
Shahbaz, T.; Ringwald, F. A.; Bunn, J. C.; Naylor, T.; Charles, P. A.; Casares, J. «The mass of the black hole in V404 Cygni». MNRAS, vol. 271, 1994, pàg. L1–L14. Bibcode: 1994MNRAS.271L..10S. DOI: 10.1093/mnras/271.1.L10.
Nowak, M. A.; Heinz, S.; Begelman, M. C. «Hiding in Plain Sight:ChandraObservations of the Quiescent Neutron Star 4U 2129+47 in Eclipse». The Astrophysical Journal, vol. 573, 2, 2002, pàg. 778. arXiv: astro-ph/0204503. Bibcode: 2002ApJ...573..778N. DOI: 10.1086/340757.
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De Beck, E.; Decin, L.; de Koter, A.; Justtanont, K.; Verhoelst, T.; Kemper, F.; Menten, K. M. «Probing the mass-loss history of AGB and red supergiant stars from CO rotational line profiles». Astronomy & Astrophysics, vol. 523, November 2010, pàg. A18. arXiv: 1008.1083. Bibcode: 2010A&A...523A..18D. DOI: 10.1051/0004-6361/200913771. ISSN: 0004-6361.
Schuster, M. T.; Marengo, M.; Hora, J. L.; Fazio, G. G.; Humphreys, R. M.; Gehrz, R. D.; Hinz, P. M.; Kenworthy, M. A.; Hoffmann, W. F. «Imaging the Cool Hypergiant NML Cygni's Dusty Circumstellar Envelope with Adaptive Optics». The Astrophysical Journal, vol. 699, 2, 2009, pàg. 1423–1432. arXiv: 0904.4690. Bibcode: 2009ApJ...699.1423S. DOI: 10.1088/0004-637X/699/2/1423.
Lissauer, Jack J.; Fabrycky, Daniel C.; Ford, Eric B.; Borucki, William J.; Fressin, Francois; Marcy, Geoffrey W.; Orosz, Jerome A.; Rowe, Jason F.; Torres, Guillermo «A closely packed system of low-mass, low-density planets transiting Kepler-11». Nature, vol. 470, 7332, 2011, pàg. 53–58. arXiv: 1102.0291. Bibcode: 2011Natur.470...53L. DOI: 10.1038/nature09760. PMID: 21293371.
Lissauer, Jack J.; Jontof-Hutter, Daniel; Rowe, Jason F.; Fabrycky, Daniel C.; Lopez, Eric D.; Agol, Eric; Marcy, Geoffrey W.; Deck, Katherine M.; Fischer, Debra A. «All Six Planets Known to Orbit Kepler-11 Have Low Densities». The Astrophysical Journal, vol. 770, 2, 2013. arXiv: 1303.0227. Bibcode: 2013ApJ...770..131L. DOI: 10.1088/0004-637X/770/2/131.
Raghavan; Henry, Todd J.; Mason, Brian D.; Subasavage, John P.; Jao, Wei‐Chun; Beaulieu, Thom D.; Hambly, Nigel C. «Two Suns in The Sky: Stellar Multiplicity in Exoplanet Systems». The Astrophysical Journal, vol. 646, 1, 2006, pàg. 523–542. arXiv: astro-ph/0603836. Bibcode: 2006ApJ...646..523R. DOI: 10.1086/504823.
Naef, D.; Mayor, M.; Korzennik, S. G.; Queloz, D.; Udry, S.; Nisenson, P.; Noyes, R. W.; Brown, T. M.; Beuzit, J. L. «The ELODIE survey for northern extra-solar planets II. A Jovian planet on a long-period orbit around GJ 777 A». Astronomy and Astrophysics, vol. 410, 3, 2003, pàg. 1051–1054. arXiv: astro-ph/0306586. Bibcode: 2003A&A...410.1051N. DOI: 10.1051/0004-6361:20031341.
«30 Cygni – Variable Star». SIMBAD Astronomical Database. Centre de Données astronomiques de Strasbourg. Arxivat de l'original el 14 December 2012. [Consulta: 31 December 2013].
De Beck, E.; Decin, L.; de Koter, A.; Justtanont, K.; Verhoelst, T.; Kemper, F.; Menten, K. M. «Probing the mass-loss history of AGB and red supergiant stars from CO rotational line profiles». Astronomy & Astrophysics, vol. 523, November 2010, pàg. A18. arXiv: 1008.1083. Bibcode: 2010A&A...523A..18D. DOI: 10.1051/0004-6361/200913771. ISSN: 0004-6361.