Ostapenko, Olga. «ENERGY EFFICIENCY OF ENERGY SUPPLY SYSTEMS, BASED ON COMBINED COGENERATION HEAT PUMP INSTALLATIONS АND PEAK SOURCES OF HEAT». Scientific Works of Vinnytsia National Technical University, no. 1 (Червень 10, 2016). дата звернення Квітень 28, 2026. https://works.vntu.edu.ua/index.php/works/article/view/462.