Dujovne , G. A., A. K. Johnson, R. R. Wilborn, R. A. Palomares, A. A. Wooldridge, and T. D. Braden. “Use Of Etonogestrel Implants To Suppress Estrous Behavior In Mares”. Clinical Theriogenology, vol. 7, no. 1, Mar. 2015, pp. 35-44, https://clinicaltheriogenology.net/index.php/CT/article/view/10090.