1. W. C. Thurber and R. J. Beaver, U.S. Atomic Energy Commission Publ. (ORNL-2602), 1959.
2. G. W. Gibson and M. J. Graber, ibid. (IN-1131), 1968.
3. D. R. de Boisblanc et al., ibid. (IN-1048), 1967.
4. W. C. Francis et al., ibid. (IDO-17154), 1966.
5. W. C. Francis and R. A. Moen, ibid. (IDO-17218), 1966.