Gianluigi Greco Enrico Malizia Luigi Palopoli Francesco Scarcello Constrained coalitional games: formal framework, properties, and complexity results. 1295-1296 2009 AAMAS (2) http://doi.acm.org/10.1145/1558109.1558260 conf/atal/2009-2 db/conf/atal/aamas2009-2.html#GrecoMPS09