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Brown, M.J. and Carter, D.L. (1969) Leaching of Added Selenium from Alkaline Soils as Influenced by Sulfate. Soil Science Society of America Proceedings. 33(4):563-565.
Robbins, C.W. and Carter, D.L. and James, D.W. (1973) Potentiometric Titration of Sulfate in Water and Soil Extracts Using a Lead-Mercury Amalgam Indicator Electrode. Soil Science Society of America Proceedings. 37(2):212-215.
Westermann, D.T. (1974) Indexes of Sulfur Deficiency in Alfalfa. I. Extractable Soil SO}4{-S. Agronomy Journal. 66(4):578-581.