Ebbinge, Bart S., Jan Blew, Preben Clausen, Klaus Günther, Colette Hall, Chas Holt, Kees Koffijberg, Sophie Le Dréan-Quénec’hdu, Roger Mahéo, and Stefan Pihl. “Population Development and Breeding Success of Dark-Bellied Brent Geese Branta B. Bernicla from 1991–2011”. Wildfowl (December 19, 2013): 74–89. Accessed December 16, 2025. https://tidsskrift.dk/Wildfowl/article/view/153605.