GJAE. Wirtschaftszahlen. German Journal of Agricultural Economics, [S. l.], v. 66, n. 3, 2017. DOI: 10.52825/gjae.v66i3.2069. Disponível em: https://www.tib-op.org/ojs/index.php/gjae/article/view/2069. Acesso em: 9 apr. 2025.