Martin Gebser Lengning Liu Gayathri Namasivayam André Neumann Torsten Schaub Miroslaw Truszczynski The First Answer Set Programming System Competition. 3-17 2007 conf/lpnmr/2007 LPNMR http://dx.doi.org/10.1007/978-3-540-72200-7_3 db/conf/lpnmr/lpnmr2007.html#GebserLNNST07