A New Galaxy Group Finding Algorithm: Probability Friends-of-FriendsDOI: info:10.1086/588183v. 6811046–1057
Liu, Hauyu Baobab, Hsieh, B. C., Ho, Paul T. P., Lin, Lihwai, and Yan, Renbin. 2008. "A New Galaxy Group Finding Algorithm: Probability Friends-of-Friends." The Astrophysical Journal, 681 1046–1057. https://doi.org/10.1086/588183.