  Let Y be a random variable whose moment generating function exists in some
neighborhood of the origin. We consider the probabilistic bivariate Bell
polynomials associated with Y and the probabilistic bivariate r-Bell
polynomials associated with Y. For those polynomials, we derive the recurrence
relations corresponding to the ones found by Zheng and Li for the bivariate
Bell polynomials and the bivariate r-Bell polynomials.
