ZENKLUSEN, Oliver; HEIM, Gilbert. A Need for Innovation?. Ökologisches Wirtschaften - Fachzeitschrift, [S. l.], v. 20, n. 4, 2005. DOI: 10.14512/oew.v20i4.415. Disponível em: https://www.oekologisches-wirtschaften.de/index.php/oew/article/view/415. Acesso em: 4 mai. 2024.