J. M. Gutiérrez, F. Chaves, E. Rojas, J. Elizondo, C. Ávila, and L. Cerdas, “Production of monovalent anti-<i>Bothrops asper</i> antivenom: development oí immune response in horses and neutralizing ability”, Rev. Biol. Trop., vol. 36, no. 2B, pp. 511–517, Nov. 1988.