1. Navy Board Report, American Nepture, July (1941) 304.
2. D. R. Houghton, Mar. Eng. Rev. April (1979) 20.
3. G. W. Bryan, Proc. Roy. Soc. 177 (1971) 389. 389.
4. G. W. Bryan, in ?Marine Pollution? Edited by R. Johnston Academic Press, New York and London, 1976 p. 185 290.
5. United Nations Report, Reports and Studies No. 2, Review of Harmful Substances (1976).