The effects of participation in European competitions on the domestic competitiveness of Polish football clubs. International Entrepreneurship Review, Poland, v. 8, n. 3, p. 81–92, 2022. DOI: 10.15678/IER.2022.0803.06. Disponível em: https://ier.uek.krakow.pl/index.php/pm/article/view/22993. Acesso em: 30 oct. 2026.