Malik, Ali h, and Luma M Baban. “The Effect of Light Curing Tip Distance on the Curing Depth of Bulk Fill Resin Based Composites ”. Journal of Baghdad College of Dentistry, vol. 26, no. 4, Dec. 2014, pp. 46-53, https://jbcd.uobaghdad.edu.iq/index.php/jbcd/article/view/590.