Ashraf M. Abdelbar Stephen T. Hedetniemi Sandra Mitchell Hedetniemi The complexity of approximating MAPs for belief networks with bounded probabilities. 283-288 2000 124 Artif. Intell. 2 db/journals/ai/ai124.html#AbdelbarHH00 http://dx.doi.org/10.1016/S0004-3702(00)00076-X