Kadthur, J.C. et al. 2011. Prognostic Value of Ki 67 Proliferation Antigen in Canine Malignant Mammary Gland Tumours. Brazilian Journal of Veterinary Pathology. 4, 1 (Mar. 2011), 36–40. DOI:https://doi.org/10.24070/bjvp.1983-0246.004006.