Silverman, J. High Energy Astrophysics, MPI for Extraterrestrial Physics, Max Planck Society;
Barkhouse, W. A., Green, P. J., Vikhlinin, A., Kim, D. W., Perley, D., Cameron, R., et al. (2006). ChaMP serendipitous galaxy cluster survey. The Astrophysical Journal, 645(2 Part 1), 955-976. doi:10.1086/504457.