GŁÓD, Grzegorz; FLAK, Olaf. Factors of competitiveness in Polish companies in the Silesian Region in 2014?2016. Oeconomia Copernicana, [S. l.], v. 8, n. 4, p. 601–619, 2017. DOI: 10.24136/oc.v8i4.37. Disponível em: https://oeconomia.pl/index.php/oc/article/view/618. Acesso em: 14 jan. 2026.