1. P. Raghavan, R. S. Raghavan, E. N. Kaufmann, K. Krien and R. A. Naumann, Bull. Am. Phys. Soc. l8, 134 (1973) and to be published.
2. H. Frauenfelder and R. M. Steffen in “Alpha-, Beta- and Gamma-Ray Spectroscopy” ed. by K. Siegbahn (North Holland, 1965) 997.
3. C.M. Lederer et al., “Table of Isotopes” (John Wiley & Sons, 1968, New York).
4. P. C. Lopiparo and R. L. Rasera in “Angular Correlations in Nuclear Disintegration” ed. by H. van Krugten and B. van Nooijen (Rotterdam Univ. Press, 1971, Netherlands) p. 66.
5. See for example E. Gerdau et al., Proc. Roy. Soc. A311, 197 (1965).