1. Binks, W. (1943). Brit. J. Radiol., 16, 49. British Medical Bulletin, Vol. 4, No. 1, 1946.
2. Ellis, F. (1948). Brit. J. Radiol., 21, 1.
3. Hills, T. H. (1948). Ibid., 21, 5i1.
4. Recommendation of the British X-ray and Radium Protection Committee;Holling, H.E.; Zak, G.,1950
5. Sievert, R. M. (1947). Brit. J. Radiol., 20, 306.