Ålind, P. (1999) “Is antagonistic behaviour by the Red-necked Grebe Podiceps ruficollis a cause for the decline of the Slavonian Grebe Podiceps auritus in southern Sweden?”, Ornis Svecica. Lund, Sweden, 9(1–2), pp. 93–95. doi: 10.34080/os.v9.22922.