Ferraz, José Bento Sterman, and Francisco Alberto de Moura Duarte. “Heterosis in Preweaning Traits in Swine”. Brazilian Journal of Veterinary Research and Animal Science, vol. 28, no. 2, Dec. 1991, pp. 235-42, https://doi.org/10.11606/issn.1678-4456.bjvras.1991.51943.