Bezerra, Daysianny de Oliveira, et al. “Esternal Morphology and Morphometry of Canine Fetuses of the Pinscher Breed to 45 Days Post-Coitus”. Semina: Ciências Agrárias, vol. 34, no. 1, Mar. 2013, pp. 335-40, doi:10.5433/1679-0359.2013v34n1p335.