1. G. Joyet, Z. angew. Math. Phys.16, 849 (1965).
2. G. Joyet, Z. Isotopenforsch. Medizin, 1967 (in Druck).
3. L. D. Marinelli, Brit. J. Radiol. (Suppl.)7, 38 (1958).
4. C. E. Miler, ANL-5829 Seminannual Report, July–Dec. 144 (1957).
5. H. A. May andL. D. Marinelli, ANL-6199 Semiannual Report, Jan.–June 71 (1960).