Alatalo, R. V., and A. Lundberg. “Clutch Size of the Pied Flycatcher Ficedula Hypoleuca-an Experiment”. Ornis Fennica 66, no. 1 (March 31, 1989): 15–23. Accessed November 22, 2024. https://ornisfennica.journal.fi/article/view/133272.