Clausen, Kevin K., Thorsten J. S. Balsby, Vianney Goma, and Jesper Madsen. “Using Re-Sighting Data to Estimate Population Size of Pink-Footed Geese (Anser Brachyrhynchus)”. Ornis Fennica 96, no. 3 (September 30, 2019): 112–123. Accessed May 11, 2024. https://ornisfennica.journal.fi/article/view/133953.