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.
A C Ferraz and G P Srivastava
J Phys C 19, 5987-5994 (1986).
A C Ferraz and G P Srivastava
Semicond Sci Technol 1, 169-171 (1986).
I P Batra, S ciraci, G P Srivastava, C Y Fong and J Nelson
Phys Rev B 34, 8246-8257 (1986).