Kengo Katayama Akihiro Hamamoto Hiroyuki Narihisa An effective local search for the maximum clique problem. 503-511 2005 95 Inf. Process. Lett. 5 http://dx.doi.org/10.1016/j.ipl.2005.05.010 db/journals/ipl/ipl95.html#KatayamaHN05