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Wyngaard GA, Russek E., Allan J.D.  1985.  Life history variation in north temperate and subtropical populations of Mesocyclops edax (Crustacea: Copepoda). Verhandlungen der Internationale Vereinigung fur Theoretische und Angewandte Limnologie. 22:3149-3153.
Koenig R.L.  1960.  Variation in tree size and quality of bigtooth aspen clones. School of Natural Resources. Master of Forestry:69pp..
Neering T.  1954.  Morphological variations in Mesovelia mulsanti (Hemiptera, Mesovelidae). The University of Kansas Science Bulletin. 36(5):125-148.