M. Abel. Latin American Conference on Artificial Intelligence in PetroleumExploration and Production, page 272-279. Rio de Janeiro, Instituto Brasileiro do Petróleo, (1991)
M. Abel, J. Castilho, and J. Campbell. World Conference in Expert Systems, volume 1 of Application of Advanced Information Technologies, page 170-177. New York, Cognizant Communication Offices, (1998)