Failure of efficacy of two ivermectin formulations against Psoroptes ovis (Hering, 1838) in sheep. FAVET [Internet]. 2020 Jun. 22 [cited 2026 Apr. 29];19(1):23-9. Available from: https://bibliotecavirtual.unl.edu.ar/publicaciones/index.php/FAVEveterinaria/article/view/9292