Greiner, J. High Energy Astrophysics, MPI for Extraterrestrial Physics, Max Planck Society;
Di Stefano, R., Kong, A. K. H., Greiner, J., Primini, F. A., Garcia, M. R., Barmby, P., et al. (2004). Supersoft X-ray sources in M31. I. A Chandra survey and an extension to quasi-soft sources. The Astrophysical Journal, 610(1), 247-260.