Queiroz, Genilson Fernandes de, et al. “Serum and Plasma Vascular Endothelial Growth Factor in Healthy Dogs”. Brazilian Journal of Veterinary Research and Animal Science, vol. 50, no. 5, Oct. 2013, pp. 359-63, https://doi.org/10.11606/issn.2318-3659.v50i5p359-363.