„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, Bd. 3, Nr. 1, S. 75–86, Okt. 2025, doi: 10.46763/ETIMA253175a.