Antoon Bronselaer Axel Hallez Guy De Tré Extensions of fuzzy measures and Sugeno integral for possibilistic truth values. 97-117 2009 24 Int. J. Intell. Syst. 2 http://dx.doi.org/10.1002/int.20327 db/journals/ijis/ijis24.html#BronselaerHT09