NIKOLAYENKO, N.; KRAVCHUK, O. Challenges to Ukraine’s energy security in the 21st century. The Copernicus Journal of Political Studies, [S. l.], n. 1, p. 55–63, 2018. DOI: 10.12775/CJPS.2018.004. Disponível em: https://apcz.umk.pl/CJPS/article/view/CJPS.2018.004. Acesso em: 19 kwi. 2024.