Aggregation Functions in Theory and in Practise Proceedings of the 7th International Summer School on Aggregation Operators at the Public University of Navarra, Pamplona, Spain, July 16-20, 2013 - Bustince, Humberto; Fernandez, Javier; Mesiar, Radko; Calvo, Tomasa (Springer Berlin Heidelberg : Imprint: Springer, 2013)