Advances Advances in Intelligent Systems and Computing : Proceedings of the 7th International Summer School on Aggregation Operators at the Public University of Navarra, Pamplona, Spain, 16.-20.6.2013. -- Vol. 228. Aggregation Functions in Theory and in Practise (2013). -- Springer, 2013. In: Advances in Intelligent Systems and Computing. -- ISSN 2194-5357.