ETTOUHAMI Mohamed Karim, MERRIMI El Bekkaye,S.BOUREKKADI EL GHARAD Abdellah. “Effect of Porosity on the Mechanical Properties of Materials”. International Journal of Control and Automation, Vol. 13, no. 4, Mar. 2020, pp. 1349 -52, http://sersc.org/journals/index.php/IJCA/article/view/33868.