Nyström, J., J. Ekenstedt, A. Angerbjörn, L. Thulin, P. Hellström, and L. Dalén. “Golden Eagles on the Swedish Mountain Tundra – Diet and Breeding Success in Relation to Prey Fluctuations”. Ornis Fennica, vol. 83, no. 4, Dec. 2006, pp. 145–152, https://ornisfennica.journal.fi/article/view/133666.