Pullliainen, E., P. Jussila, and P. S. Tunkkari. “Variation in the Laying Intervals of the Pied Flycatcher and the Redstart”. Ornis Fennica 71, no. 3 (September 30, 1994): 109–114. Accessed November 25, 2024. https://ornisfennica.journal.fi/article/view/133400.