db/journals/jacm/BellNNS94.html Colin Bell Anil Nerode Raymond T. Ng V. S. Subrahmanian Mixed Integer Programming Methods for Computing Nonmonotonic Deductive Databases. 1178-1215 1994 41 J. ACM 6 db/journals/jacm/jacm41.html#BellNNS94 http://doi.acm.org/10.1145/195613.195637 JACM/41/P1178.pdf