Zeitschriftenartikel
Förschler, M. I.; Foerschler, L.; Dorka, U.: Population fluctuations of siskins Carduelis spinus, common crossbills Loxia curvirostra, and citril finches Carduelis citrinella in relationship to flowering intensity of spruce Picea abies. Ornis Fennica
83 (2), S. 91 - 96 (2006)