KUŹMAR, Sławomir. Procyclicality of Labour Productivity in Polish Regions in 1995-2013. DEMO, Poland, v. 5, n. 5, p. 158–175, 2017. DOI: 10.18559/SOEP.2017.5.10. Disponível em: https://ojs34.fimagis.pl/index.php/demo/article/view/1003. Acesso em: 18 apr. 2026.