  This paper provides bifactor gamma distribution, trivariate gamma
distribution and two copula families on [0, 1] n obtained from the Laplace
transforms of the multivariate gamma distribution and the multi-factor gamma
distribution given by [P ($\theta$)] --$\lambda$ and [P ($\theta$)] --$\lambda$
n i=1 (1 + pi$\theta$i) --($\lambda$ i --$\lambda$) respectively, where P is an
affine polynomial with respect to the n variables $\theta$1,. .. , $\theta$n.
These copulas are new generalized Farlie-Gumbel-Morgenstern copulas and allow
in particular to obtain multivariate gamma distributions for which the
cumulative distribution functions and the probability distribution functions
are known.
