Kartikasari, D.S., Riyanto, P., Widayati, R.I., Budiastuti, A., Malik, D.A., Muslimin and Hardian 2023. The The effectiveness of topical cysteamine in treating melasma: A systematic review and meta-analysis. Journal of Pakistan Association of Dermatologists. 33, 4 (Oct. 2023), 1469–1484.