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Zhang, Shuinai, Wang, Q. Daniel, Foster, Adam R., Sun, Wei, Li, Zhiyuan, and Ji, Li. 2019. "XMM-Newton RGS Spectroscopy of the M31 Bulge. I. Evidence for a Past AGN Half a Million Years Ago." The Astrophysical Journal, 885 157. https://doi.org/10.3847/1538-4357/ab4a0f.