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Zehnder, S; Akesson, S; Liechti, F; Bruderer, B (2002). Observation of free-flying nocturnal migrants at Falsterbo: occurence of reversed flight directions in autumn. Avian Science, 2(2):103-113.
Zehnder, S; Akesson, S; Liechti, F; Bruderer, B (2001). Nocturnal autumn bird migration at Falsterbo, South Sweden. Journal of Avian Biology, 32(3):239-248.