Montaldo, H. H., and C. A. Meza-Herrera. “Use of Molecular Markers and Major Genes in the Genetic Improvement of Livestock”. Electronic Journal of Biotechnology, vol. 1, no. 2, Aug. 1998, pp. 0-0, https://preprints.pucv.cl/index.php/ejbiotechnology/article/view/v1n2-4.