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Frost TM.  1991.  Porifera Chapter 4. Ecology and Classification of North American Freshwater Invertebrates.. :95-124.
Frost TM, Elias JE.  1990.  The balance of autotrophy and heterotrophy in three freshwater sponges with algal symbionts. New Perspectives in Sponge Biology: Proceedings of the Third International Conference on the Biology of Sponges. :478-484.