Article PubMed
American journal of primatology  (2005)

Cytologic, hormonal, and ultrasonographic correlates of the menstrual cycle of the New World monkey Cebus apella.

Ortiz, R E; Ortiz, A C; Gajardo, G; Zepeda, A J; Parraguez, V H; Ortiz, M E; Croxatto, H B