Aghdeab, Shukry, Nareen Obaeed, and Marwa Ibraheem. “Surface Roughness Prediction for Steel 304 In Edm Using Response Graph Modeling”. Al-Khwarizmi Engineering Journal 14, no. 4 (November 29, 2018): 115- 124. Accessed August 14, 2021. https://alkej.uobaghdad.edu.iq/index.php/alkej/article/view/64.