Enrique Herrera-Viedma José Luis García-Lapresta Janusz Kacprzyk Mario Fedrizzi Hannu Nurmi Slawomir Zadrozny 267 2011 Springer http://dx.doi.org/10.1007/978-3-642-20533-0 978-3-642-20532-3 Studies in Fuzziness and Soft Computing db/series/sfsc/Herrera11.html