Kampe-Persson, Hakon. “How Large Proportion of the Bean Geese Counted in Sweden Was Made up of Taiga Bean Geese Anser Fabalis Fabalis?”. Ornis Svecica 21, no. 1 (January 1, 2011): 58–60. Accessed November 22, 2024. https://journals.lub.lu.se/os/article/view/22611.