Gilfanov, Marat High Energy Astrophysics, MPI for Astrophysics, Max Planck Society;
Li, Z., Spitler, L. R., Jones, C., Forman, W. R., Kraft, R. P., Di Stefano, R., et al. (2010). X-ray emission from the sombrero galaxy: discrete sources. The Astrophysical Journal, 721(2), 1368-1382. doi:10.1088/0004-637X/721/2/1368.