Ugli, Azizbek Rakhmonov Yigitali, and Sharofov Salokhiddin Sirojidinovich. 2024. “The Methods for Improving the Efficiency of Flat Solar Collectors”. American Journal of Engineering , Mechanics and Architecture (2993-2637) 2 (4):159-66. http://grnjournal.us/index.php/AJEMA/article/view/4479.