OWEN, Myrfyn; WELLS, Richard. Territorial behaviour in breeding geese--a re-examination of Ryder’s hypothesis. Wildfowl, [S. l.], v. 30, p. 20–26, 1979. Disponível em: https://tidsskrift.dk/Wildfowl/article/view/154133. Acesso em: 19 apr. 2026.