1. Medical Besearch Council, “The Hazards to Man of Nuclear and Allied Radiations” (H.M.S.O., London, 1956).
2. National Academy of Sciences “The Biological Effects of Atomic Radiation” (National Academy of Sciences—National Research Council, Washington, 1956).
3. Carter, T. C., Lyon, M. F., and Phillips, R. J. S., data quoted by Carter T. C., in “Advances in Radiobiology”, edit. by de Hevesy, G. C., Forssberg, A. G., and Abbatt, J. D. (Oliver and Boyd, Edinburgh, 1957).
4. Russell, W. L., Cold Spring Harbor Symp. Quant. Biol., 16, 327 (1951).
5. Russell, W. L., and Kelly, E. M., Science, 127, 1062 (1958).