John D. Ramer, Thomas A. Jenssen, Charles J. Hurst, Size-Related Variation in the Advertisement Call of Rana clamitans (Anura: Ranidae), and Its Effect on Conspecific Males, Copeia, Vol. 1983, No. 1 (Feb. 10, 1983), pp. 141-155
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Ramer et al. (1983) studied this question.
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