MATROZIS, Ruslans. A 30-year (1988-2017) study of Mute Swans Cygnus olor in Riga, Latvia. Wildfowl, [S. l.], p. 164–177, 2019. Disponível em: https://tidsskrift.dk/Wildfowl/article/view/154489. Acesso em: 16 dec. 2025.