D. de León and J. Fernández-Van Cleve, “EFFICACY OF MK-401 (4-AMINO-6 TRICHLOROETHENYL-1,3 BENZENEDISULFONMIDE) AGAINST FASCIOLA HEPATICA INARTIFICIALLY INFECTED CALVES”, JAUPR, vol. 68, no. 4, pp. 479–481, Oct. 1984.