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Biological sex identification in the endangered dusky gopher frog (Lithobates sevosa): a comparison of body size measurements, secondary sex characteristics, ultrasound imaging, and urinary hormone analysis methods.
Graham KM, Kouba AJ, Langhorne CJ, Marcec RM, Willard ST. Graham KM, et al. Among authors: langhorne cj. Reprod Biol Endocrinol. 2016 Aug 2;14(1):41. doi: 10.1186/s12958-016-0174-9. Reprod Biol Endocrinol. 2016. PMID: 27484119 Free PMC article.