XU, Changhong; XU, Changhua. Energy Transition, Environmental Sustainability and Healthcare Costs in Emerging Sub-Saharan Economies: Evidence from the Pre- and During-COVID-19 Periods – Implications for SDG 3, SDG 7 and SDG 13 . Problemy Ekorozwoju , [S. l.], v. 21, n. 1, p. 173–204, 2026. DOI: 10.35784/preko.7743. Disponível em: https://ph.pollub.pl/index.php/preko/article/view/7743. Acesso em: 14 jan. 2026.