U. N. Khemani, U. S. Khopkar, and C. S. Nayak, “A comparison study of the clinical efficacy and safety of topical adapalene gel (0.1%) and tretinoin cream (0.025%) in the treatment of acne vulgaris”, Int J Basic Clin Pharmacol, vol. 5, no. 3, pp. 628–634, Dec. 2016.