RIVERA-ANAYA, J. D.; BERROCAL, C. M. "Valsyn Mix" In Comparative Studies of the Prevention of Coliform Diarrhea in Calves. The Journal of Agriculture of the University of Puerto Rico, [S. l.], v. 50, n. 4, p. 280–292, 1966. DOI: 10.46429/jaupr.v50i4.3467. Disponível em: https://revistas.upr.edu/index.php/jaupr/article/view/3467. Acesso em: 11 aug. 2022.