Sidiq, M.; Ganga vellaisamy, S.; Gopalan, K.; Kandasamy, M. A Comparative Study of Efficacy & Tolerability of 30% Salicylic Acid Versus 20% Salicylic Acid + 10% Mandelic Acid Peel for Acne Vulgaris. J Pak Assoc Dermatol 2019, 29, 188-195.