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Berthold, P., Gwinner, E. Jahresperiodik der Gonadengröße beim Fichtenkreuzschnabel(Loxia curvirostra) . J Ornithol 119, 338–339 (1978). https://doi.org/10.1007/BF01643212
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DOI: https://doi.org/10.1007/BF01643212