Solonen, T., and J. Karhunen. “Effects of Variable Feeding Conditions on the Tawny Owl Strix Aluco Near the Northern Limit of Its Range”. Ornis Fennica 79, no. 3 (September 30, 2002): 121–131. Accessed November 25, 2024. https://ornisfennica.journal.fi/article/view/133579.