If you have trouble locating any of these papers please contact an author for a reprint. A few of the later G.P. Srivastava Group papers are available as on line Postscript documents.
G P Srivastava
J Phys: CM 5, 4695-4710 (1993).
W G Schmidt and G P Srivastava
J Phys: CM 5, 9025-9036 (1993).