ALMEIDA, A. H. de; STERMAN, F. de A.; MIGLINO, M. A. Ultrasonographic measurement of placental dimensions normal pregnant Boxers and its correlation to the gestational period. Brazilian Journal of Veterinary Research and Animal Science, [S. l.], v. 40, n. supl., p. 136-140, 2003. DOI: 10.1590/S1413-95962003000800007. Disponível em: https://www.revistas.usp.br/bjvras/article/view/11435. Acesso em: 21 sep. 2021.