Advances in Practical Applications of Agents, Multi-Agent Systems, and Sustainability: The PAAMS Collection 13th International Conference, PAAMS 2015, Salamanca, Spain, June 3-4, 2015, Proceedings - Demazeau, Yves; Decker, Keith S.; Bajo Pérez, Javier; de la Prieta, Fernando (Springer International Publishing : Imprint: Springer, 2015)