1. L. D. Marinelli, Brit. J. Radiol. Suppl.7, 38 (1958).
2. C. E. Miller, ANL-5829, Semiannual Report, July–December 144 (1957).
3. H. A. May andL. D. Marinelli, ANL-6199, Semiannual Report, January–June 71 (1960).
4. H. A. May andL. D. Marinelli, Symposium I.A.E.A. Vienna, June 1961.
5. G. Joyet andA. Hauptmann, Z. f. angew. Math. u. Phys.16, 547 (1965).