HOLGERSEN, Holger. Pinkfeet in Europe - The effect of cold weather of February 1956 on the distribution of Pink-footed Geese in north-west Europe. Wildfowl, [S. l.], p. 5, 1957. Disponível em: https://tidsskrift.dk/Wildfowl/article/view/155500. Acesso em: 13 feb. 2026.