1. Akaiwa, H.: Abundance of selenium, tellurium, and indium in meteorites. J. Geophys. Res. 71, 1919 (1966).
2. Alicino, J. F., and J. A. Kowald: Analytical methods. In D. L. Klayman and W. H. H. Gunther (eds.): Organic selenium compounds: Their chemistry and biology, Chap. X VII. New York: Wiley-Interscience (1973).
3. Allaway, W. H., E. Cary, and C. F. Ehlig: The cycling of low levels of selenium in soils, plants and animals. In O. H. Muth (ed.): Selenium in biomedicine, Chap. 17. Westport, Conn.: Avi Publishing Co. (1967).
4. Allaway, W. H.: Control of environmental levels of selenium. In D. D. Hemphill (ed.): Trace substances in environmental health II, pp. 181 - 206. Columbia, Mo.: Univ. Missouri (1968).
5. Allaway, W. H.: Distribution of selenium. In: Selenium in nutrition. Washington, D. C.: Nat. Acad. Sci. (1971).