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.
W Tan, J C Inkson and G P Srivastava
(NATO workshop on advanced research, Canada (Sept 1993)-- published in Quantum Well Interband Transition Physics and Devices, Eds. H C Liu et al; Kluwer Academic Publishers, 1994) 411-420
W Tan, J C Inkson and G P Srivastava
Semicond Sci Technol 9, 1305-1315 (1994).