Amin, Soma, and Shokhan H. Azeez. “Gingival Pigmentation Pattern in Correlation to Skin Color in a Group of Kurdish People in Sulaimani City”. AL-Kindy College Medical Journal, vol. 18, no. 3, Dec. 2022, pp. 237-42, https://doi.org/10.47723/kcmj.v18i3.874.