Pulliainen, E. “Heart/Body Weight Ratio in the Willow Grouse Lagopus Lagopus and Rock Ptarmigan Lagopus Mutus in Finnish Lapland”. Ornis Fennica 57, no. 2 (July 1, 1980): 88–90. Accessed November 23, 2024. https://ornisfennica.journal.fi/article/view/133039.