1. Allsopp, C. B., Brit. J. Radiol., 21, 72 (1948).
2. Lea, D. E., "Action of Radiation on Living Cells", 46 (Camb. Univ. Press, 1946).
3. Weiss, J., Brit. J. Radiol., Supp. 1, 56 (1947).
4. Frilley, M., Brit. J. Radiol., Supp. 1, 50 (1947).
5. Lea, D. E., Smith, K. M., Holmes, B., and Markham, R., Parasitology, 36, 110 (1944).