Naoyuki Horiguchi Masaaki Kitazume Hiroyuki Nakasora The Hall-Janko graph and the Witt system W<sub>10</sub>. 1-8 2008 29 Eur. J. Comb. 1 http://dx.doi.org/10.1016/j.ejc.2007.02.012 db/journals/ejc/ejc29.html#HoriguchiKN08