1. P. M. FRENCH and D. J. HODKIN, in “Plutonium 1965” (Institute for Metals, London, 1969) p. 697.
2. M. TOKAR, LA-DC-72-187 (1970).
3. C. GANGULY, P. V. HEGDE, G. C. JAIN, U. BASAK, R. S. MEHROTRA, S. MAJUMDAR and P. R. ROY,Nuclear Technol. 70 (1986).
4. A. K. SENGUPTA, C. GANGULY and P. R. ROY, BARC/I-810 (1984).
5. D. C. FEE and C. E. JOHNSON, ANL-AFP-10 (1975).