Rios, L., Z. Rondon, O. Verde, and J. de Combellas. “FR 40. Preliminary Results on Factors Affecting Lambing Intervals of Ewes in Tropical Conditions”. Latin American Archives of Animal Production, Vol. 5, no. 3, Oct. 2005, https://ojs.alpa.uy/index.php/ojs_files/article/view/306.