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Carter, D.L. and Brown, M.J. and Allaway, W.H. and Cary, E.E. (1968) Selenium Content of Forage and Hay Crops in the Pacific Northwest. Agronomy Journal. 60(5):532-534.
Kubota, J. and Allaway, W.H. and Carter, D.L. and Cary, E.E. and Lazar, V.A. (1967) Selenium in Crops in the United States in Relation to Selenium-Responsive Diseases of Animals. Journal of Agricultural and Food Chemistry. 15(3):448-453.