Abbasi, M., Z. Moradi, M. Mirzaei, M. J. Kharazifard, and S. Rezaei. “Polymerization Shrinkage of Five Bulk-Fill Composite Resins in Comparison With a Conventional Composite Resin”. Frontiers in Dentistry, Vol. 15, no. 6, Nov. 2018, pp. 365-74, http://jdt.tums.ac.ir/index.php/jdt/article/view/2637.