ALZINA LÓPEZ, A.; SEGURA CORREA, J. C.; ÁLVAREZ FLEITES, M.; ORTÍZ CASTAÑEDA, J. J. Real time ultrasonography evaluation for early pregnancy diagnosis in sows. Veterinaria México OA, [S. l.], v. 38, n. 003, 2009. Disponível em: https://veterinariamexico.fmvz.unam.mx/index.php/vet/article/view/183. Acesso em: 20 apr. 2025.