Toshinori Yamada Kazuhiro Karasawa On Finding a Solution in the Core of a Multicommodity Flow Game on a Spider. 1011-1014 2006 conf/apccas/2006 APCCAS http://dx.doi.org/10.1109/APCCAS.2006.342259 db/conf/apccas/apccas2006.html#YamadaK06