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- Sutter, Ernst (1957). "Radar als Hilfsmittel der Vogelzugforschung". Orn. Beob. 54: 70–96. Lack, David; Varley, G. C (1945). "Detection of Birds by Radar"...4 KB (523 words) - 22:26, 27 March 2024
Springer, M. (1970). Zur Ernährung des uhus Bubo bubo im Oberengadin. Orn. Beob, 67, 77-94. Leditznig, C., Leditznig, W., & Gossow, H. (2001). 15 Jahre...98 KB (14,076 words) - 23:03, 23 July 2024
Nos oiseaux, 26(289–290), 124–131. Bütikofer, E (1909). Der Waldkauz. Orn. Beob. 7: 37–40. de Brichambaut, J.P. (1978). Mode de dépouillement de mammifères...86 KB (12,409 words) - 14:36, 14 January 2024
