M. Sidiq, S. Ganga vellaisamy, K. Gopalan, and M. Kandasamy, “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, vol. 29, no. 2, pp. 188–195, Oct. 2019.