Enemar, A., and O. Arheimer. “Developmental Asynchrony and Onset of Incubation Among Passerine Birds in a Mountain Birch Forest of Swedish Lapland”. Ornis Fennica 66, no. 1 (March 31, 1989): 32–40. Accessed November 22, 2024. https://ornisfennica.journal.fi/article/view/133274.