2008, Part of book or chapter of book (Tuyls, K.; Nowe, A.; Guessoum, Z. (ed.), Adaptive Agents and Multi-Agent Systems III, Adaptation and Multi-Agent Learning, 5th, 6th, and 7th European Symposium, ALAMAS 2005-2007 on Adaptive and Learning Agents and Multi-Agent Systems, Revised Selected Papers, pp. 15-26)