Afework, Y. “VARIABLE MESH STIFFNESS OF SPUR GEAR TEETH USING FINITE ELEMENT METIIOD”. Zede: Journal of Ethiopian Engineers and Architects የኢትዮጵያ መሐንዲሶችና አርክቴክቶች መጽሔት, vol. 23, Jan. 2023, pp. 59-66, https://ejol.aau.edu.et/index.php/ZEDE/article/view/6532.