X-Ray Emissivity of Old Stellar Populations: A Local Group CensusDOI: info:10.1088/0004-637X/812/2/130v. 812130
Ge, Chong, Li, Zhiyuan, Xu, Xiaojie, Gu, Qiusheng, Wang, Q. Daniel, Roberts, Shawn, Kraft, Ralph P., Jones, Christine, and Forman, William R. 2015. "X-Ray Emissivity of Old Stellar Populations: A Local Group Census." The Astrophysical Journal, 812 130. https://doi.org/10.1088/0004-637X/812/2/130.