Abdulateef, Osamah, Enas Khalid, and Amer Hoss. 2013. “Drilling of FR-4 Composite Materials Using Single Pulse of Nd:YAG Laser”. Al-Khwarizmi Engineering Journal 9 (2), 1-11. https://alkej.uobaghdad.edu.iq/index.php/alkej/article/view/163.