1. White, G. ..Natl. Bur. Standards Report No. 2763, 1953.
2. Wolicki and others ..Naval Research Laboratory Report, pp. 4833.
3. Heitler, W. ..Quantum Theory of Radiation, 1955.
4. Wapstra and Nijgh..Nucl. Phys., 1956,1, 245.
5. Nordlinget al... Ibid., 1956,1, 326.