Ostapenko, Olga. «SPHERES OF ENERGY EFFICIENT OPERATION OF ENERGY SUPPLY SYSTEMS WITH COGENERATION-HEAT PUMP INSTALLATIONS АND PEAK SOURCES OF HEAT». Scientific Works of Vinnytsia National Technical University, no. 3 (Грудень 13, 2016). дата звернення Травень 7, 2026. https://works.vntu.edu.ua/index.php/works/article/view/479.