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 (December 13, 2016). Accessed April 25, 2024. https://works.vntu.edu.ua/index.php/works/article/view/479.