Hanski, I. K., and Y. Haila. “Singing Territories and Home Ranges of Breeding Chaffinches: Visual Observation Vs. Radio-Tracking”. Ornis Fennica 65, no. 3 (September 30, 1988): 97–103. Accessed November 22, 2024. https://ornisfennica.journal.fi/article/view/133263.