GJAE. Wirtschaftszahlen. German Journal of Agricultural Economics, [S. l.], v. 68, n. 4, 2019. DOI: 10.52825/gjae.v68i4.2149. Disponível em: https://www.tib-op.org/ojs/index.php/gjae/article/view/2149. Acesso em: 6 apr. 2025.