BYANOVA, Nevena. FROM FOSSIL FUELS TO RENEWABLE ENERGY: TRACKING BULGARIA’S TRANSITION. ENVIRONMENT. TECHNOLOGIES. RESOURCES. Proceedings of the International Scientific and Practical Conference, Rezekne, Latvia, v. 1, p. 90–94, 2024. DOI: 10.17770/etr2024vol1.7958. Disponível em: https://journals.rta.lv/index.php/ETR/article/view/7958.. Acesso em: 19 dec. 2024.