Gianluigi Greco Enrico Malizia Luigi Palopoli Francesco Scarcello On the Complexity of Compact Coalitional Games. 147-152 2009 IJCAI http://ijcai.org/papers09/Papers/IJCAI09-035.pdf conf/ijcai/2009 db/conf/ijcai/ijcai2009.html#GrecoMPS09