Khalid, T., Maan, M. A., & Shehzad, K. (2016). Comparison of efficacy and safety of topical glyceryl trinitrate vs. oral nifedipine in idiopathic perniosis: results of a randomized clinical trial. Journal of Pakistan Association of Dermatologists, 24(4), 342–347. Retrieved from https://www.jpad.com.pk/index.php/jpad/article/view/224