Nyström, Bodil, and Hans Nyström. 1991. “Effects of Bad Weather on the Breeding of the Redpoll Carduelis Flammea in a Year With a Poor Birch Seed Crop in Southern Lapland”. Ornis Svecica 1 (2). Lund, Sweden:65-68. https://doi.org/10.34080/os.v1.23105.