WITKOWSKA, Janina. Polish Market of Production Factors and the Process of European Integration. Comparative Economic Research. Central and Eastern Europe, Poland, v. 10, n. 3, p. 65–77, 2007. DOI: 10.18778/1508-2008.10.13. Disponível em: https://czasopisma.uni.lodz.pl/CER/article/view/29770. Acesso em: 9 sep. 2026.