Senthilnathan, S, M Baskaran, S Thirumalai, and MB Naarayanen. 1970. “A Comparative Study to Evaluate Gingival Depigmentation Using Scalpel Blade Technique and CO2 Lasers”. Journal of Orofacial Research 4 (1): 59-62. https://mansapublishers.com/jofr/article/view/1981.