Bredeweg, B., Salles, P., Bouwer, A., Liem, J., Nuttle, T., Cioaca, E., …Zitek, A. (2008). Towards a structured approach to building qualitative reasoning models and simulations. ECOLOGICAL INFORMATICS, 3(1), 1-12. https://doi.org/10.1016/j.ecoinf.2007.02.002