F. Grimaldo, M. Lozano, und F. Barber. AAMAS'08: Proc. 7th Int'l Jt. Conf. on
Autonomous agents and multiagent systems, Seite 183--190. Estoril, Portugal, (2008)
F. Grimaldo, M. Lozano, und F. Barber. Innovations in Hybrid Intelligent Systems, Volume 44 von Advances in Soft Computing, Kapitel 5, Springer, Berlin, (2008)