Zapata Salas R, Velásquez Vélez R, Herrera Ospina LV, Ríos Osorio L, Polanco Echeverry DN. Prevalence of gastrointestinal nematodes in sheep and goat production systems under confinement, semi-confinement and grazing in municipalities of Antioquia, Colombia. Rev. investig. vet. Perú. 2016;27(2):344-354. doi:10.15381/rivep.v27i2.11647