Hiromitsu Hattori Tadachika Ozono Takayuki Ito Toramatsu Shintani Coalition Formation among Agents in Complex Problems Based on a Combinatorial Auction Perspective. 176-187 http://dx.doi.org/10.1007/978-3-540-24677-0_20 2004 conf/ieaaie/2004 IEA/AIE db/conf/ieaaie/ieaaie2004.html#HattoriOIS04