Olga, Ostapenko. 2018. “SUBSTANTIATION OF THE METHOD OF COMPLEX ASSESSMENT OF ENERGY-ECOLOGICAL-ECONOMIC EFFICIENCY OF ENERGY SUPPLY SYSTEMS WITH COGENERATION HEAT PUMP INSTALLATIONS AND PEAK SOURCES OF HEAT”. Scientific Works of Vinnytsia National Technical University, no. 1 (June). https://works.vntu.edu.ua/index.php/works/article/view/526.