1. V. Kuryshkin:Annales de la Fondation Louis de-Broglie,5, 111 (1980).
2. S. Naka:Prog. Theor. Phys.,59, 2107 (1978).
3. M. Schmutz:Physica A (The Hague),101, 1 (1980).
4. J. Cigler:Monatsh. Math.,88, 87 (1979).
5. A. Janntjssis, L. Papaloucas andP. Siafarioas:Eigenfunctions and eigenvalues of the q-differential operator, reprint (1980), Department of Theoretical Physios, University of Patras, Greece.