Abdullah, M., S. Aghdeab, و S. Ghazi. Optimization of Surface Roughness for Al-Alloy in Electro-Chemical Machining (ECM) Using Taguchi Method. مجلة الهندسة, م 23, عدد 10, Oct. 2017, ص 62-71, http://joe.uobaghdad.edu.iq/index.php/main/article/view/171.