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
Pramana (India) 6, 1-18 (1976).
G P Srivastava
Pramana (India) 7, 236-244 (1976).