Why is Voluntary Co-operation Condemned to Failure? Reflections on the Polish and German Background. Lex localis - Journal of Local Self-Government, [S. l.], v. 7, n. 4, p. 347–369, 2009. DOI: 10.4335/7.4.347-369(2009). Disponível em: http://lex-localis.org/index.php/LexLocalis/article/view/7.4.347-369%282009%29. Acesso em: 27 oct. 2025.