Korpimäki, E. “Clutch Size and Breeding Success of Tengmalm`s Owl Aegolius Funereus in Natural Cavities and Nest-Boxes”. Ornis Fennica 61, no. 3 (September 30, 1984): 80–83. Accessed September 19, 2024. https://ornisfennica.journal.fi/article/view/133151.