Ostapenko, Olga, Vadym Leshchenko, і Roman Tikhonenko. «Energy Efficiency of Energy Supply Systems, Based on Combined Cogeneration Heat Pump Installations». Scientific Works of Vinnytsia National Technical University, no. 4 (Березень 2, 2016). дата звернення Травень 20, 2026. https://works.vntu.edu.ua/index.php/works/article/view/451.