Thingstad, Per Gustav, Ole Jakob Sørensen, and Vladimir Naumov. “Bird Communities in European Taiga Forest: A Comparison Between a Large Forest Block in Archangelsk, Russia, and Some Small-Grained Old-Growth Fragments in Central Norway”. Ornis Norvegica 29 (January 1, 2006): 46-58. Accessed August 12, 2020. https://boap.uib.no/index.php/ornis/article/view/186.