CHRISTIANSEN, S. Field crop ecosystems. Ed. by C. J. Pearson. - (Ecosystems of the World; 18). Geografisk Tidsskrift - Danish Journal of Geography, [S. l.], v. 93, 1993. Disponível em: https://tidsskrift.dk/geografisktidsskrift/article/view/42250. Acesso em: 19 oct. 2024.