T. Finin, "Pfc Users Manual", TechReport, August 1999, 361 downloads.
1989
T. Finin, R. Fritzson, and D. Matuszek, "Adding forward chaining and truth maintenance to Prolog", InProceedings, Proceedings of the Fifth IEEE Conference on Artificial Intelligence Applications, March 1989, 1726 downloads.
UMBC ebiquity