R. de A. Freitas, B. R. S. A. da Silva, C. do V. A. Athar, J. P. M. Marinho, C. C. P. da Veiga, and J. P. Paiva, “Staging of chronic kidney disease in domestic dogs with chronic valve disease”, Braz. J. Vet. Med., vol. 38, no. Supl.2, pp. 31–39, Nov. 2016.