Some Systems of Multivariable Orthogonal Askey-Wilson Polynomials
  In 1991 Tratnik derived two systems of multivariable orthogonal Wilson polynomials and considered their limit cases. q-Analogues of these systems are derived, yielding systems of multivariable orthogonal Askey-Wilson polynomials and their special and limit cases. 
George Gasper and Mizan Rahman