Jakubas, Dariusz. 2003. “Factors Affecting Different Spatial Distribution of Wintering Tufted Duck Aythya Fuligula and Goldeneye Bucephala Clangula in the Western Part of the Gulf of Gdańsk (Poland)”. Ornis Svecica 13 (2–3). Lund, Sweden:75-84. https://doi.org/10.34080/os.v13.22810.