1. Okada, S., in: Radiation Biochemistry, Vol. I, Chap. VII, p. 260; p. 266. New York: Academic Press 1970
2. Puck, T. T., Marcus, P. I.: J. Exp. Med.103, 653 (1956)
3. Elkind, M.M., Whitmore, G. F., in: The Radiobiology of Cultured Mammalian Cells. New York: Gordon and Breach 1967
4. see e.g.: Radiation Protection and Sensitization (Eds. H. Moroson and M. Quintiliani). London: Taylor and Francis; New York: Barnes and Noble 1970
5. Dewey, D. L.: Nature186, 780 (1960)