VADOUD NAJJARI
ASGHAR RAHIMI

In 2004, Rodr guez-Lallena and Ubeda-Flores have introduced a class of bivariate copulas which generalizes some known families such as the Farlie-Gumbel-Morgenstern distributions. In 2006, Dolati and Ubeda-Flores presented multivariate generalizations of this class. Then in 2011, Kim et al. generalized Rodr guez-Lallena and Ubeda-Flores' study to any given copula family. But there are some inaccuracies in the study by Kim et al. We mean toconsider the interval for the parameter proposed by Kim et al. and show that it is inaccurate.