Kampe-Persson, Hakon. “Historical Occurrence of the Lesser White-Fronted Goose Anser Erythropus in the Atlantic Flyway”. Ornis Svecica 18, no. 2 (April 1, 2008): 69–81. Accessed May 4, 2024. https://journals.lub.lu.se/os/article/view/22671.