BULUT, H.; ÖNER, Y.; SÖZEN, Çağlar. Clustering of Member and Candidate Countries of the European Union. International Journal of Sciences: Basic and Applied Research (IJSBAR), [S. l.], v. 36, n. 7, p. 18–25, 2017. Disponível em: https://www.gssrr.org/index.php/JournalOfBasicAndApplied/article/view/8274. Acesso em: 2 may. 2024.