SIMONIS, Udo Ernst. Rio-Konferenz - was war, was bleibt?. Ökologisches Wirtschaften - Fachzeitschrift, [S. l.], v. 7, n. 3-4, 1992. DOI: 10.14512/oew.v7i3-4.728. Disponível em: https://www.oekologisches-wirtschaften.de/index.php/oew/article/view/728. Acesso em: 14 juni. 2025.