Christer Carlsson, Robert Fullér. On Possibilistic Mean Value, Variance, Covariance and Correlation of Fuzzy Numbers. In Imre J. Rudas, János C. Fodor, Janusz Kacprzyk, editors, Towards Intelligent Engineering and Information Technology. Volume 243 of Studies in Computational Intelligence, pages 17-36, Springer, 2009. [doi]
Abstract is missing.