Rolstad, J., and E. Rolstad. “Seasonal Patterns in Home Range and Habitat Use of the Grey-Headed Woodpecker Picus Canus As Influenced by the Availability of Food”. Ornis Fennica 72, no. 1 (March 31, 1995): 1–13. Accessed September 19, 2024. https://ornisfennica.journal.fi/article/view/133408.