1. Wollman, E., and Lacassague, A., Ann. Inst. Pasteur, 64, 5 (1940).
2. Luria, S. E., and Exner, F. W., Proc. U.S. Nat. Acad. Sci., 27, 370 (1941).
3. Lea, D. E., Actions of Radiations on Living Cells (Macmillan Co., New York, 1947).
4. Pollard, E. C., The Physics of Viruses (Academic Press Inc., New York, 1953).
5. McCrea, J. F., Ann. N.Y. Acad. Sci., 83, 692 (1960).