DRENT, R; SWIERSTRA, P. Goose flocks and food finding: field experiments with Barnacle Geese in winter. Wildfowl, [S. l.], v. 28, p. 6, 1977. Disponível em: https://tidsskrift.dk/Wildfowl/article/view/154361. Acesso em: 5 apr. 2026.