Ostapenko, O. (2017) «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, (1), с. 1–8. доступний у: https://works.vntu.edu.ua/index.php/works/article/view/497 (дата звернення: 3Липень2026).