MEISSNER, W.; CIOPCIŃSKA, K. Behaviour of Mute Swans Cygnus olor wintering at a municipal beach in Gdynia, Poland. Ornis Svecica, Lund, Sweden, v. 17, n. 3–4, p. 148–153, 2007. DOI: 10.34080/os.v17.22685. Disponível em: https://journals.lub.lu.se/os/article/view/22685. Acesso em: 10 dec. 2022.