Järvinen, A. “Patterns and Causes of Long-Term Variation in Reproductive Traits of the Pied Flycatcher Ficedula Hypoleuca in Finnish Lapland”. Ornis Fennica 66, no. 1 (March 31, 1989): 24–31. Accessed November 22, 2024. https://ornisfennica.journal.fi/article/view/133273.