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\bibitem{Graham_etal1995} Graham, L. H., Goodrowe, K. L., Raeside, J. I., \& Liptrap, R. M. (1995). Non-invasive monitoring of ovarian function in several felid species by measurement of fecal estradiol-17-beta and progestins. \textit{Zoo Biology}, \textit{14}(3), 223--237.

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