Kunytskyi , M.O. “THE USE OF HEAT PUMPS IN COMBINED HEATING SYSTEMS FOR URBAN INFRASTRUCTURE”. Municipal economy of cities. Series: «Economy science» 1, no. 189 (April 2, 2025): 217–224. Accessed June 16, 2025. https://khges.kname.edu.ua/index.php/khges/article/view/6468.