1. Mattauch, J., and Fluegge, S., "Nuclear Physics Tables and an Introduction to Nuclear Physics", 104 (Interscience Publishers, Inc., New York, 1946).
2. Kohman, T. P., Phys. Rev., 73, 16 (1948).
3. Eastman, E. D., Phys. Rev., 46, 1 (1934).
4. Eastman, E. D., Phys. Rev., 52, 1226 (1937).
5. Itsikson, M. I., and Rusanov, A. K., C. R. Acad. Sci. U.R.S.S., 53, 631 (1946).