FROM FOSSIL FUELS TO RENEWABLE ENERGY: TRACKING BULGARIA’S TRANSITION. ENVIRONMENT. TECHNOLOGY. RESOURCES. Proceedings of the International Scientific and Practical Conference, [S. l.], v. 1, p. 90–94, 2024. DOI: 10.17770/etr2024vol1.7958. Disponível em: https://archive-journals.rtu.lv/etr/article/view/4748.. Acesso em: 11 mar. 2026.