KUŹMAR, Sławomir. Procyclicality of Labour Productivity in Polish Regions in 1995-2013. Studia Oeconomica Posnaniensia, Poznan, Polska, v. 5, n. 5, p. 158–175, 2017. DOI: 10.18559/2pwe1123. Disponível em: https://journals.ue.poznan.pl/soep/article/view/3626. Acesso em: 3 sep. 2026.