Umurzakova Guzal Rinatovna, and Nasretdinova Feruza Nabievna. “EFFICIENCY OF SOLAR COLLECTORS AND WATER HEATING UNITS AND DEVELOPMENT OF METHODOLOGICAL BASIS OF THEIR THERMAL TESTS”. JournalNX - A Multidisciplinary Peer Reviewed Journal, vol. 7, no. 03, Mar. 2021, pp. 231-5, https://repo.journalnx.com/index.php/nx/article/view/2760.