N. Choisunirachon, Y. Tanaka, K. Saeki, N. Sasaki, R. Nishimura, and T. Nakagawa, “Proliferative Index and Microvessel Density as Potential Prognostic Markers of Canine Oral Malignant Melanomas”, TJVM, vol. 44, no. 4, pp. 435–443, Dec. 2014.