Edenius, Lars, Thomas Brodin, and Peter Sunesson. “Winter Behaviour of the Grey-Headed Woodpecker Picus Canus in Relation to Recent Population Trends in Sweden”. Ornis Svecica 9, no. 1–2 (April 1, 1999): 65–74. Accessed April 24, 2024. https://journals.lub.lu.se/os/article/view/22917.