Chandra Observations of Comets C/2012 S1 (ISON) and C/2011 L4 (PanSTARRS)DOI: info:10.3847/0004-637X/818/2/199v. 818199
Snios, Bradford, Kharchenko, Vasili, Lisse, Carey M., Wolk, Scott J., Dennerl, Konrad, and Combi, Michael R. 2016. "Chandra Observations of Comets C/2012 S1 (ISON) and C/2011 L4 (PanSTARRS)." The Astrophysical Journal, 818 199. https://doi.org/10.3847/0004-637X/818/2/199.