1. Knowledge processing in geology: major problems and future trends;Abel,1991
2. Abel, M, 2001. Estudo da pericia em petrografia sedimentar e sua importância para a engenharia da conhecimento. Doctoral work, PPGC-UFRGS, Universidade Federal do Rio Grande do Sul, Porto Alegre, Brazil.
3. Analysis of expertise for implementing geological expert systems;Abel,1998
4. PetroGrapher: managing petrographic data and knowledge using an intelligent database application;Abel,2002
5. BEICIP,1999. Website of BEICIP, RML (Reservoir Modeling Line), GEOSURF Software,http://www.beicip.com.