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2. Andersen‐Harild, P. Weight changes in Cygnus olor. Proceedings of the 2nd International Swan Symposium. 1980, Sapporo, Japan. Edited by: Matthews, G.V.T. and Smart, M. pp.191–208. Slimbridge: International Wildfowl Research Bureau.
3. An analysis of weight changes in the Mute SwanCygnus olor