Uiprasertkul, M., P. Mahaisavariya, V. Khawcharoenporn, and N. Wongvisitsak. “Pathological Study of Pigmented Dermatofibrosarcoma Protuberans”. Siriraj Medical Journal, vol. 53, no. 8, Aug. 2020, pp. 517-22, https://he02.tci-thaijo.org/index.php/sirirajmedj/article/view/244991.