GÜMÜŞ, Yasin Kerem. How Secure is the EU Energy Policy after the Ukraine Crisis?. International Journal of Energy Economics and Policy, [S. l.], v. 5, n. 4, p. 1016–1021, 2015. Disponível em: https://mail.econjournals.org.tr/index.php/ijeep/article/view/1165. Acesso em: 10 jan. 2025.