BACON, P J; MOUNTFORD, M D. The effects of genotypic and yearly variations on the egg volumes of the Mute Swan Cygnus olor. Wildfowl, [S. l.], p. 7–12, 1990. Disponível em: https://tidsskrift.dk/Wildfowl/article/view/154055. Acesso em: 17 dec. 2025.