CIOK, S.; JAKUBOWICZ, E. THE COMPETITIVENESS OF THE SILESIAN REGION. Economic and Environmental Studies, [S. l.], v. 5, p. 9–21, 2021. Disponível em: https://czasopisma.uni.opole.pl/index.php/ees/article/view/3445. Acesso em: 1 jun. 2025.