Omyma El-Kady, Moustafa M. Mohammed, A. F. Meselhy, A. Wazeer, M. N. Elsheikh,. 2020. “Experimental Study on Tribological Properties of Cu- Al2O3 Coated Ag Nano Composite”. International Journal of Advanced Science and Technology 29 (3), 2218-29. http://sersc.org/journals/index.php/IJAST/article/view/4316.