1. G. N. Watson, A treatise on the theory of Bessel functions,
2. M. H. Annaby, Z. S. Mansour, q-Fractional Calculus and Equations (Lecture Notes in Mathematics 2056),
3. M. E. H. Ismail, Classical and Quantum Orthogonal Polynomials in One Variable,
4. i>The basic Gamma-Function and the Elliptic functions;F. H. Jackson;Proc. R. Soc. Lond. A
5. i>The applications of basic numbers to Bessel's and Legendre's equations