B. Houshmand, N. Janbakhsh, F. Khalilian, and M. R. Talebi Ardakani, “Efficacy of Conventional Laser Irradiation Versus a New Method for Gingival Depigmentation (Sieve Method): A Clinical Trial”, J laser Med Sci, vol. 8, no. 2, pp. 88–94, Apr. 2017.