Ostapenko, Olga. «ENERGY EFFICIENCY OF ENERGY SUPPLY SYSTEMS WITH COGENERATION HEAT PUMP INSTALLATIONS АND PEAK SOURCES OF HEAT IN HEAT SUPPLY SYSTEMS». Scientific Works of Vinnytsia National Technical University, no. 2 (Серпень 26, 2016). дата звернення Травень 7, 2026. https://works.vntu.edu.ua/index.php/works/article/view/472.