R. Leclair, Jr., J. Castanet, A Skeletochronological Assessment of Age and Growth in the Frog Rana pipiens Schreber (Amphibia, Anura) from Southwestern Quebec, Copeia, Vol. 1987, No. 2 (May 13, 1987), pp. 361-369
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Leclair et al. (1987) studied this question.
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