1. Reznikoff, C. A., Brankow, D. W. & Heidelberger, C. Cancer Res. 33, 3231–3238 (1973).
2. Reznikoff, C. A., Brankow, D. W. & Heidelberger, C. Cancer Res. 33, 3239–3249 (1973).
3. Terzaghi, M. & Little, J. B. Int. J. Radiat. Biol. 29, 583–587 (1976).
4. Borek, C. & Hall, E. J. Nature 252, 499–501 (1974).
5. Elkind, M. M., Sutton-Gilbert, H., Moses, W. B., Alescio, T. & Swain, R. W. Radiat. Res. 25, 359–376 (1965).