1. Vinogradov, A. P., The Elementary Chemical Composition of Marine Organisms, 551 (Sears Foundation for Marine Research, Yale University, 1953).
2. Lunde, G., Intern. Rev. Ges. Hydrobiol., 52, 265 (1967).
3. Lunde, G., J. Amer. Oil Chem. Soc., 45, 331 (1968).
4. Lunde, G., J. Sci. Food Agric., 19, 432 (1968).
5. Underwood, E. J., Trace Elements in Human and Animal Nutrition, 329 (Academic Press, New York and London, 1962).