«LONG-TERM POWER PURCHASE AGREEMENT FOR PHOTOVOLTAIC ENERGY AS A SOLUTION FOR ENHANCING THE PROFITABILITY OF THE TASHMARUNISHTA PUMPED-STORAGE HYDRO POWER PLANT: UDC: [621.311.214+621.311.243](497.782)». ETIMA 3, no. 1 (октябрь 27, 2025): 75–86. просмотрено апрель 24, 2026. https://js.ugd.edu.mk/index.php/etima/article/view/7557.