1. Gasper, G. and Rahman, M.,Basic Hypergeometric Series, Cambridge University Press, Cambridge, 1990.
2. Floreanini, R. and Vinet, L., Quantum algebras andq-special functions,Ann. Phys. 221 (1993), 53?79.
3. Miller, W.,Symmetry and Separation of Variables, Addison-Wesley, Reading, Mass, 1977.
4. Blumen, G. and Cole, J., The general similarity solution of the heat equation,J. Math. Mech. 18, 1025?1042 (1969); Kalnins, E. and Miller, W., Lie theory and separation of variables, 5: The equationsiU t +U xx = 0 andiU t +U xx ?c/x 2 U = 0,J. Math. Phys. 15, 1728?1737 (1974).
5. Al-Salam, W. A. and Carlitz, L., Some orthogonalq-polynomials,Math. Nachr. 30, 47?61 (1965).