Aleem, H., F. Amin, F. Ahmed, and A. Tariq. “EFFECTS OF DIFFERENT BLEACHING AGENTS ON MICROHARDNESS OF COMPOSITE RESINS”. Pakistan Oral & Dental Journal, Vol. 37, no. 3, Sept. 2017, pp. 488-91, https://podj.com.pk/index.php/podj/article/view/67.