KOLOSOV, V. A.; KLEMESHEV, A. P.; ZOTOVA, M. V.; SEBENTSOV, A. B. Russia-European Union Borderlands: Transboundary Gradients, Interactions and Current Challenges. International Journal of Economics and Financial Issues, [S. l.], v. 5, n. 2S, p. 5–12, 2015. Disponível em: https://www.econjournals.com/index.php/ijefi/article/view/1586. Acesso em: 25 may. 2022.