1. S. H. Devare, P. N. Tandon andH. G. Devare:Phys. Rev.,131, 1750 (1963).
2. W. B. Walters, C. E. Bemis jr., andG. E. Gordon:Phys. Rev.,140, B 268 (1965).
3. N. Ahmed:Thesis, London University, 1965.
4. J. H. Reiler andP. R. Bell: α, βand γRay Spectrometry, vol.1, ch. 5, edited byK. Siegbahn (Amsterdam, 1965).
5. R. L. Heath: A.E.C. Research Development Report 1 DO-16880-1, vol.1, 2nd edition (1964).