Ostapenko, Olga. «SPHERES OF HIGH ENERGY EFFICIENCY OF ENERGY SUPPLY SYSTEMS WITH COGENERATION-HEAT PUMP INSTALLATIONS OF SMALL POWER АND FUEL-FIRED BOILERS IN HEAT SUPPLY SYSTEMS». Scientific Works of Vinnytsia National Technical University, no. 1 (Липень 5, 2017): 1–8. дата звернення Червень 20, 2026. https://works.vntu.edu.ua/index.php/works/article/view/497.