1. Algal assay procedure: Bottle test;Environmental Protection Acency. National Eutrophication Research Program,1971
2. Methods for chemical analysis of water and wastes;Environmental Protection Agency. Water Quality Office,1971
3. Availability of iron and manganese in southern Wisconsin lakes for the growth of Microcystis aeruginosa;Gerloff;Ecology,1957
4. Molybdenum as an essential micronutrient and useful watermass marker in Castle Lake, California;Goldman,1967
5. Relationship of trace elements to algae growth;Koelling,1971