Kratz WA, Myers J (1955). "Nutrition and Growth of Several Blue-Green Algae". American Journal of Botany. 42 (3): 282. doi:10.2307/2438564. JSTOR2438564.
Kratz WA, Myers J (1955). "Nutrition and Growth of Several Blue-Green Algae". American Journal of Botany. 42 (3): 282. doi:10.2307/2438564. JSTOR2438564.