POLAK, Marcin. Clutch and egg size variation in the Marsh Harrier Circus aeruginosus in eastern Poland. Ornis Svecica, Lund, Sweden, v. 20, n. 2, p. 63–66, 2010. DOI: 10.34080/os.v20.22638. Disponível em: https://journals.lub.lu.se/os/article/view/22638. Acesso em: 18 jul. 2024.