Belay, L. ., and N. . Gabbiye. “INVESTIGATING PERFORMANCE OF VERTICAL CARBONIZING KILN FOR BRIQUETTE PRODUCTION”. Zede: Journal of Ethiopian Engineers and Architects የኢትዮጵያ መሐንዲሶችና አርክቴክቶች መጽሔት, vol. 33, Feb. 2023, pp. 35-44, https://ejol.aau.edu.et/index.php/ZEDE/article/view/6488.