Jordi Recasens Indistinguishability Operators - Modelling Fuzzy Equalities and Fuzzy Equivalence Relations 260 2011 1-231 Springer Studies in Fuzziness and Soft Computing http://dx.doi.org/10.1007/978-3-642-16222-0 http://dx.doi.org/10.1007/978-3-642-16222-0 978-3-642-16221-3