Kun Huang Dafang Zhang Li'e Wang An Activeness-Based Seed Choking Algorithm for Enhancing BitTorrent's Robustness. 376-387 2009 GPC http://dx.doi.org/10.1007/978-3-642-01671-4_34 conf/gpc/2009 db/conf/gpc/gpc2009.html#HuangZW09