Santos, Gustavo Martins Gomes dos, et al. “Reproductive Performance of Woolly and Hairless Crossbred Ewes Treated With an Exogenous Progestagen and ECG Hormone During the Non-Breeding Season”. Semina: Ciências Agrárias, vol. 32, no. 2, July 2011, pp. 723-32, doi:10.5433/1679-0359.2011v32n2p723.