L. F. Fattak, “Efficiency of Optical Non-Destructive Testing Method to Detect Surface Defects in Engineering Materials”, NUCEJ, vol. 18, no. 1, pp. 118–127, Jan. 2015, Accessed: Jan. 31, 2026. [Online]. Available: https://oldjournal.eng.nahrainuniv.edu.iq/index.php/main/article/view/163