Abdullah, M., Aghdeab, S., & Ghazi, S. (2017). Optimization of Surface Roughness for Al-alloy in Electro-chemical Machining (ECM) using Taguchi Method. مجلة الهندسة, 23(10), 62-71. استرجع في من http://joe.uobaghdad.edu.iq/index.php/main/article/view/171