Marc Denecker Joost Vennekens Stephen Bond Martin Gebser Miroslaw Truszczynski The Second Answer Set Programming Competition. 637-654 2009 LPNMR http://dx.doi.org/10.1007/978-3-642-04238-6_75 conf/lpnmr/2009 db/conf/lpnmr/lpnmr2009.html#DeneckerVBGT09