J. Alvarado and J. M. Gutiérrez, “Anticoagulant effect of myotoxic phospholipase A<sub>2</sub> isolated from the venom of the snake <i>Bothrops asper</i> (Viperidae)”, Rev. Biol. Trop., vol. 36, no. 2B, pp. 563–565, Nov. 1988.