Samer Hassan Luis Garmendia Juan Pavón Agent-Based Social Modeling and Simulation with Fuzzy Sets. 40-47 2008 Innovations in Hybrid Intelligent Systems http://dx.doi.org/10.1007/978-3-540-74972-1_7 series/asc/2008-44 db/series/asc/asc44.html#HassanGP08