Srivastava, Sumedha, Trilok Shrivastava, Shivani Dwivedi, and Pramod Yadav. 1970. “Gingival Melanin Depigmentation: A Review and Case Report”. Journal of Orofacial Research 4 (1):50-54. https://mansapublishers.com/index.php/jofr/article/view/1979.