Wilman, David J. Optical and Interpretative Astronomy, MPI for Extraterrestrial Physics, Max Planck Society;
Hou, A., Parker, L. C., Harris, W. E., & Wilman, D. J. (2009). Statistical tools for classifying galaxy group dynamics. The Astrophysical Journal, 702(2), 1199-1210. doi:10.1088/0004-637X/702/2/1199.