Ferry, Björn, Håkan Rune, Ulf Andersson, and Martin Green. “Increasing Numbers of Wintering Forest Birds in Swedish Lapland 1986–2017 Show Stronger Correlations With Forest Development Than With Local Weather”. Ornis Svecica 30 (February 29, 2020): 13–30. Accessed March 4, 2021. https://journals.lub.lu.se/os/article/view/19633.