Masatoshi Noumi, Jasper V. Stokman, Askey–Wilson polynomials: an affine Hecke algebra approach, in Laredo Lectures on Orthogonal Polynomials and Special Functions (R.Alvarez-Nodarse, F.Marcellan and W.Van Assche, Eds), pp. 111–144, Nova Science Publishers, 2004 math.QA/0001033