KRASIN, Kremen. DEVELOPMENT AND EFFECTIVENESS OF RENEWABLE ENERGY SOURCES IN BULGARIA THROUGH THE LENS OF THE EUROPEAN ENERGY. E-Journal VFU, [S. l.], n. 26, p. 1109–1128, 2026. DOI: 10.53606/evfu.26.1109-1128. Disponível em: https://ejournal.vfu.bg/index.php/vfu/article/view/420. Acesso em: 5 nov. 2026.