Hasani Tabatabaei, M., F. Farahat, Z. Hassani, and E. Ahmadi. “Effect of Accelerated Aging on Color Change of Direct and Indirect Fiber-Reinforced Composite Restorations”. Frontiers in Dentistry, Vol. 13, no. 3, Dec. 2016, pp. 168-75, http://jdt.tums.ac.ir/index.php/jdt/article/view/808.