Laor Boongasame Ho-fung Leung Veera Boonjing Dickson K. W. Chiu Forming Buyer Coalitions with Bundles of Items. 714-723 2009 KES-AMSTA http://dx.doi.org/10.1007/978-3-642-01665-3_72 conf/kesamsta/2009 db/conf/kesamsta/kesamsta2009.html#BoongasameLBC09