Ostapenko, Olga, Olga Shevchenko, і Olena Bakum. «ENERGY EFFICIENCY OF HEAT PUMPING STATIONS WITH DIFFERENT HEAT SOURCES ON CONDITION OF VARIABLE OPERATION MODES». Scientific Works of Vinnytsia National Technical University, no. 4 (Листопад 25, 2015). дата звернення Квітень 28, 2026. https://works.vntu.edu.ua/index.php/works/article/view/394.