Aryn . Е. Theoretical aspects of the problematic regions typology. Economic series of the Bulletin of L.N. Gumilyov ENU, [S. l.], n. 2, p. 17–25, 2023. DOI: 10.32523/2079-620X-2019-2-17-25. Disponível em: https://bulecon.enu.kz/index.php/main/article/view/209. Acesso em: 21 jan. 2026.