Kouki, J., and U. Häyrinen. “On the Relationship Between Distribution and Abundance in Birds Breeding on Finnish Mires: The Effect of Habitat Specialization”. Ornis Fennica 68, no. 4 (December 31, 1991): 170–177. Accessed April 19, 2025. https://ornisfennica.journal.fi/article/view/133330.