Roger B. Nelsen José Juan Quesada-Molina José Antonio Rodríguez-Lallena Manuel Úbeda-Flores Kendall distribution functions and associative copulas. 52-57 2009 160 Fuzzy Sets and Systems 1 http://dx.doi.org/10.1016/j.fss.2008.05.001 db/journals/fss/fss160.html#NelsenQRU09