Zamora, J., G. Reinhardt, M. Polette, P. Macías, and I. González. “Escherichia Coli Isolated from Diarrheic Piglets. Presumption of Cytotoxic Necrotizing Factor (CNF) Producing-Strains”. Archivos De Medicina Veterinaria, vol. 32, no. 1, June 2000, pp. 75-81, doi:10.4067/S0301-732X2000000100009.