Sahlu , Assay, and Abebe Dinku. “Construction Site Wastes (non-Physical) Categorization in Addis Ababa Based on Lean Concept”. Zede Journal of Ethiopian Engineers and Architects 39 (February 8, 2023): 31–43. Accessed November 24, 2024. http://ejol.aau.edu.et/index.php/ZEDE/article/view/6551.