1. Rauth, A. M., and Hutchinson, F., Biological Effects of Ionizing Radiation at the Molecular Level, 25 (Intern. Atomic Energy Agency, Vienna, 1962).
2. Hutchinson, F., and Pollard, E., Mechanisms in Radiobiology, 1 (Academic Press, New York, 1961).
3. Bethe, H. A., Ann. der Physik, 5, 325 (1930).
4. Bohm, D., and Pines, D., Phys. Rev., 82, 625 (1961).
5. Birkhoff, R. D., Physical Processes in Radiation Biology, 145 (Academic Press, New York, 1964).