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William D. McKenzie, Jr., David Crews, Klaus D. Kallman, David Policansky, Joel J. Sohn, Age, Weight and the Genetics of Sexual Maturation in the Platyfish, Xiphophorus maculatus, Copeia, Vol. 1983, No. 3 (Aug. 16, 1983), pp. 770-774
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McKenzie et al. (1983) studied this question.
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