1. Gross D.H.E., L. Satpathy, M. Ta-chung and M. Satpathy, Z. Phys. A309, 4 (1982); Friedman W.A. and W.G. Lynch, Phys. Rev. C28, 16 (1983);ibid, 950.
2. Bhattacharya C., S.K. Basu, S. Bhattacharya, A. Chakrabarti, S. Chattopadhyay, M.R. DuttaMajumdar, K. Krishnan, G.S.N. Murty, B. Sinha, M.D. Trivedi, Y.P. Viyogi, S.K. Dutta and R.K. Bhowmick, Phys. Rev. C44, 1049 (1991).
3. De T.K., R.N. Mukherjee and B.B. Baliga, Nucl. Instr. Meth. B42, 138 (1989).
4. Mukherjee R.N., T.K. De and B.B. Baliga, Nuovo Cim.105A, 6 (1992).
5. Mukherjee R.N., T.K. De and B.B. Baliga, (to be published).