WYSZKOWSKA‑KUNA, Joanna. Productivity Performance of the Service Sectors in European Union Countries. Comparative Economic Research. Central and Eastern Europe, [S. l.], v. 22, n. 4, p. 7–22, 2019. DOI: 10.2478/cer-2019-0029. Disponível em: https://www.czasopisma.uni.lodz.pl/CER/article/view/6035. Acesso em: 10 dec. 2025.