Saydullaev Sirozhiddin Rakhmatillaevich. “USE OF SOLAR ENERGY AS A SOURCE OF HEAT AND ISSUES OF HEAT ENERGY SAVING”. Galaxy International Interdisciplinary Research Journal, vol. 9, no. 12, Dec. 2021, pp. 1298-02, https://internationaljournals.co.in/index.php/giirj/article/view/916.