Yuichi Asahiro Takashi Horiyama Kazuhisa Makino Hirotaka Ono Toshinori Sakuma Masafumi Yamashita 2247-2262 2006 154 Discrete Applied Mathematics 16 http://dx.doi.org/10.1016/j.dam.2006.04.020 db/journals/dam/dam154.html#AsahiroHMOSY06