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2. J.E. Oldfield, Proc Symp. Ind. Uses of Selenium and Tellurium (Toronto 1980), 299, available from the Selenium-Tellurium Development Assoc., Darien. CT.
3. The effect of selenate, selenite, and sulfate on the growth of six unicellular marine algae
4. The determination of selenium in sea water, silicates and marine organisms