Songsantiphap, C., and C. Kumtornrut. “Thyroid fibrosarcoma associated with neurofibromatosis type 1: A case report”. Thai Journal of Dermatology, vol. 36, no. 2, June 2020, pp. 78-82, https://he02.tci-thaijo.org/index.php/TJD/article/view/240549.