K. Graupe et al. Combined use of 20% azelaic acid cream and 0.05% tretinoin cream in the topical treatment of melasma articleCombined use of 20% azelaic acid cream and 0.05% tretinoin cream in the topical treatment of melasmaK. Graupe et al.Journal of Dermatological Treatment, vol. 7, no. 4, 1996, pp. 235–237PDF
