Ronald R. Yager Janusz Kacprzyk Gleb Beliakov Recent Developments in the Ordered Weighted Averaging Operators: Theory and Practice 265 2011 http://dx.doi.org/10.1007/978-3-642-17910-5 978-3-642-17909-9 Springer Studies in Fuzziness and Soft Computing db/series/sfsc/Yager11.html