Ostapenko, Olga, Iryna Valigura, and Anastasiya Kovalenko. “ENERGY ECOLOGICAL EFFICIENCY OF HEAT PUMPING STATIONS, OPERATING ON NATURAL AND INDUSTRIAL SOURCES OF HEAT AT VARIABLE OPERATION MODES”. Scientific Works of Vinnytsia National Technical University, no. 2 (November 25, 2015). Accessed April 25, 2024. https://works.vntu.edu.ua/index.php/works/article/view/376.