VOOUS KH (1959) Literatuur: Viking Olsson: Dispersal, migration, longevity and death causes at Strix aluca, Buteo buteo, Ardea cinerea and Lams argentatus. Acta Vertebratica I (2), 1958. LIMOSA 32 (3): 179-180.

Viking Olsson: Dispersal, migration, longevity and death causes at Strix aluca, Buteo buteo, Ardea cinerea and Lams argentatus. Acta Vertebratica I (2), 1958

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