Toro, A., Rubilar, L., Palma, C. and Pérez, R. (2014) “Anthelmintic resistance of gastrointestinal nematode in sheep treated with ivermectin and fenbendazole”, Archivos de Medicina Veterinaria, 46(2), pp. 247–252. doi: 10.4067/S0301-732X2014000200010.