David M. Sever, Male Secondary Sexual Characters of the Eurycea bislineata (Amphibia, Urodela, Plethodontidae) Complex in the Sourthern Appalachian Mountains, Journal of Herpetology, Vol. 13, No. 3 (Jul. 30, 1979), pp. 245-253
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David M. Sever (1979) studied this question.
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