Förschler MI, Förschler 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 Fenn [Internet]. 2006Jul.1 [cited 2024May9];83(2):91–96. Available from: https://ornisfennica.journal.fi/article/view/133659