“Processes of Regional Convergence in Poland in the Context of the Use of European Union Funds”. Lex localis - Journal of Local Self-Government 14, no. 4 (October 31, 2016): 715–737. Accessed November 2, 2025. https://lex-localis.org/index.php/LexLocalis/article/view/14.4.715-737%282016%29.