“Retrofit an Existing Building Envelope as a Tool to Improve the Energy Performance of Buildings”, Int. J. Curr. Eng. Technol., vol. 9, no. 1, pp. 22–32, Feb. 2019, Accessed: Mar. 13, 2026. [Online]. Available: https://ijcet.evegenis.org/index.php/ijcet/article/view/880