Paul E. Dunne Trevor J. M. Bench-Capon The Maximum Length of Prime Implicates for Instances of 3-SAT. 317-329 1997 92 Artif. Intell. 1-2 db/journals/ai/ai92.html#DunneB97 http://dx.doi.org/10.1016/S0004-3702(97)00018-0