E. L. de A. Ribeiro, L. das D. F. da Silva, M. A. da Rocha, and I. Y. Mizubuti, “<b>The effect of matings started in spring or’summer on the reproductive performance of Hampshire Down ewes<b>”;, Semina: Ciênc. Agrár., vol. 20, no. 1, pp. 39–43, Jan. 1999.