Kazuhiro Suzuki Dongvu Tonien Kaoru Kurosawa Koji Toyota Birthday Paradox for Multi-Collisions. 39-45 2008 91-A IEICE Transactions 1 http://dx.doi.org/10.1093/ietfec/e91-a.1.39 db/journals/ieicet/ieicet91a.html#SuzukiTKT08