ESSELINK, Hans; BEEKMAN, Jan H. Between year variation and causes of mortality in the non-breeding population of the Mute Swan Cygnus olor in the Netherlands, with special reference to hunting. Wildfowl, [S. l.], p. 110–119, 2013. Disponível em: https://tidsskrift.dk/Wildfowl/article/view/154997. Acesso em: 16 dec. 2025.