1. Norward, W.D., in: Proceedings of the 13th International Congress on Occupational Health, New York, 1960, p. 335.
2. Waldron-Edward, D., Paul, T.M., Skoryna, S.C.: Can. Med. Assn. J. 91 (1964) 1006.
3. Hesp, R., Ramsbottom, B.: PG Report 686 UKAEA, 1965.
4. Hesp, R., Ramsbottom, B.: Strontium Metabolism (Leniham, J.M.A., Loutit, J.M., Martin, J.H. eds.) Academic Press, London (1967) 311.
5. Lagerquist, C.R., Putzier, C.A., Piltingsgrud, C.W.: Health Phys. 13 (1967) 965.