Nguyen , Dinh Manh, Grace Ding, and Göran Runeson. “Energy and Economic Analysis of Environmental Upgrading of Existing Office Buildings”. Construction Economics and Building 20, no. 4 (November 18, 2020). Accessed April 26, 2024. https://epress.lib.uts.edu.au/journals/index.php/AJCEB/article/view/7239.