Niazi, S., and A. Shehzad. “Comparison of Efficacy of Fixed Low-Dose Regimens (daily Vs Alternate Day) of Oral Isotretinoin in Mild to Moderate Acne Vulgaris”. Journal of Pakistan Association of Dermatologists, vol. 25, no. 4, Nov. 2016, pp. 291-7, http://www.jpad.com.pk/index.php/jpad/article/view/149.