1. Araújo, S.C.S., 2005. Modelos de Simulação Baseados em Raciocínio Qualitativo para Avaliação da Qualidade da Água em Bacias Hidrográficas. Doctoral thesis, Department of Ecology, University of Brasília, Brasília. (in Portuguese).
2. Bredeweg, B., 1992. Expertise in Qualitative Prediction of Behavior. PhD thesis, University of Amsterdam, Amsterdam.
3. Garp3 — a new workbench for qualitative reasoning and modelling;Bredeweg,2006
4. Ecological applications of qualitative reasoning;Bredeweg,2006
5. Towards a Structured Approach to Qualitative Modelling. Ecological Informatics;Bredeweg,2007