1. M. N. Rosenbluth, Los Alamos Rept. L. A. 2030 (1957);
2. alsoProceedings of the Third International Conference on Ionization Phenonema in Gases(Società Italiana di Fisica, Milan, Italy, 1958).
3. M. H. Boon, E. W. Laing, J. Randles, S. J. Roberts, and R. J. Tayler, A.E.R.E., Harwell, England, Rept. T∕R 2503; also R. J. Tayler,Proceedings of the Second United Nations International Conference on the Peaceful Uses of Atomic Energy(United Nations, Geneva, 1958), Vol. 31, p. 160.