Fahad, Fatima, and Manhal A Majeed. “Fracture Resistance of Weakened Premolars Restored With Sonically-Activated Composite, Bulk-Filled and Incrementally-Filled composites(A Comparative in Vitro Study)”. Journal of Baghdad College of Dentistry, vol. 26, no. 4, Dec. 2014, pp. 22-27, https://jbcd.uobaghdad.edu.iq/index.php/jbcd/article/view/586.