L. Simonetti, G. Ramos, and J. C. Gardón, “Effect of estrus synchronization and artificial insemination on reproductive performance of Merino sheep”, Braz. J. Vet. Res. Anim. Sci., vol. 39, no. 3, pp. 143–146, Jan. 2002, doi: 10.1590/S1413-95962002000300006.