D. de León and R. Quiñones, “THE EFFICACY OF MK-401 (4-AMINO-6 TRICHLOROETHENYL-1,3-BENZENEDISULFONOMIDE) AGAINT FASCIOLA HEPATICA IN CATTLE UNDER PUERTO RICAN CONDITIONS”, JAUPR, vol. 67, no. 1, pp. 53–55, Jan. 1983.