Odden, M., P. Wegge, S. Eliassen, and M. H. Finne. 2003. “The Influence of Sexual Size Dimorphism on the Dietary Shifts of Capercaillie Tetrao Urogallus During Spring”. Ornis Fennica 80 (3):130–136. https://ornisfennica.journal.fi/article/view/133600.