Kolev R. STRUCTURAL ANALYSIS OF THE COSTS AND THEIR EFFICIENCY INMARITSA-IZTOK 2 TPP EAD FOR THE PERIOD 2013-2022. VFU [Internet]. 2024 Aug. 22 [cited 2026 Feb. 23];(22):154-71. Available from: https://ejournal.vfu.bg/index.php/vfu/article/view/19