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Weaver, H. A.; Feldman, P. D.; a'Hearn, M. F.; Arpigny, C.; Brandt, J. C.; Festou, M. C.; Haken, M.; McPhate, J. B.; Stern, S. A.; Tozzi, G. P. (1997). "The Activity and Size of the Nucleus of Comet Hale-Bopp (C/1995 O1)". Science. 275 (5308): 1900-1904. Bibcode:1997Sci...275.1900W. doi:10.1126/science.275.5308.1900. PMID9072959.
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Lisse, C. M.; Christian, D. J.; Dennerl, K.; Meech, K. J.; Petre, R.; Weaver, H. A.; Wolk, S. J. (2001). "Charge Exchange-Induced X-Ray Emission from Comet C/1999 S4 (LINEAR)". Science. 292 (5520): 1343-8. Bibcode:2001Sci...292.1343L. doi:10.1126/science.292.5520.1343. PMID11359004.
"The Cometary Nucleus". Department of Earth and Space Sciences, UCLA. April 2003. 11 Mayıs 2010 tarihinde kaynağından arşivlendi. Erişim tarihi: 31 Temmuz 2013.
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Eyles, C. J.; Harrison, R. A.; Davis, C. J.; Waltham, N. R.; Shaughnessy, B. M.; Mapson-Menard, H. C. A.; Bewsher, D.; Crothers, S. R.; Davies, J. A.; Simnett, G. M.; Howard, R. A.; Moses, J. D.; Newmark, J. S.; Socker, D. G.; Halain, J.-P.; Defise, J.-M.; Mazy, E.; Rochus, P. (2008). "The Heliospheric Imagers Onboard the STEREO Mission"(PDF). Solar Physics. 254 (2): 387. Bibcode:2009SoPh..254..387E. doi:10.1007/s11207-008-9299-0. hdl:2268/15675. 25 Şubat 2021 tarihinde kaynağından arşivlendi(PDF). Erişim tarihi: 26 Ekim 2021.
Dutch, Steven. "Comets". Natural and Applied Sciences, University of Wisconsin. 29 Temmuz 2013 tarihinde kaynağından arşivlendi. Erişim tarihi: 31 Temmuz 2013.
"The Cometary Nucleus". Department of Earth and Space Sciences, UCLA. April 2003. 11 Mayıs 2010 tarihinde kaynağından arşivlendi. Erişim tarihi: 31 Temmuz 2013.
Jewitt, David. "Comet Holmes Bigger Than The Sun". Institute for Astronomy at the University of Hawaii. 28 Ağustos 2009 tarihinde kaynağından arşivlendi. Erişim tarihi: 31 Temmuz 2013.
Eyles, C. J.; Harrison, R. A.; Davis, C. J.; Waltham, N. R.; Shaughnessy, B. M.; Mapson-Menard, H. C. A.; Bewsher, D.; Crothers, S. R.; Davies, J. A.; Simnett, G. M.; Howard, R. A.; Moses, J. D.; Newmark, J. S.; Socker, D. G.; Halain, J.-P.; Defise, J.-M.; Mazy, E.; Rochus, P. (2008). "The Heliospheric Imagers Onboard the STEREO Mission"(PDF). Solar Physics. 254 (2): 387. Bibcode:2009SoPh..254..387E. doi:10.1007/s11207-008-9299-0. hdl:2268/15675. 25 Şubat 2021 tarihinde kaynağından arşivlendi(PDF). Erişim tarihi: 26 Ekim 2021.
Dutch, Steven. "Comets". Natural and Applied Sciences, University of Wisconsin. 29 Temmuz 2013 tarihinde kaynağından arşivlendi. Erişim tarihi: 31 Temmuz 2013.
"The Jupiter Family Comets". Department of Terrestrial Magnetism Carnegie Institution of Washington. 8 Haziran 2009 tarihinde kaynağından arşivlendi. Erişim tarihi: 11 Ağustos 2013.
"Comets – where are they ?". British Astronomical Association. 6 Kasım 2012. 5 Ağustos 2013 tarihinde kaynağından arşivlendi. Erişim tarihi: 11 Ağustos 2013.