1. Spin Leonard pairs;Curtin;Ramanujan J.,2006
2. Some formulas for spin models on distance-regular graphs;Curtin;J. Combin. Theory Ser. B,1999
3. Basic Hypergeometric Series;Gasper,1990
4. Some algebra related to P- and Q-polynomial association schemes;Ito,2001
5. Koekoek, Suwartouw, The Askey scheme of hypergeometric orthogonal polynomials and its q-analog, Reports of the Faculty of Technical Mathematics and Informatics, vol. 98-17, Delft, Netherlands, 1998.