H. Farid, M. S. Shinwari, F. R. Khan, and F. Tanwir, “JOURNEY FROM BLACK TO PINK GUMS: MANAGEMENT OF MELANIN INDUCED PHYSIOLOGICAL GINGIVAL HYPER PIGMENTATION”, J Ayub Med Coll Abbottabad, vol. 29, no. 1, pp. 132–138, Jan. 2017.