Kristiansen, J N, A J Walsh, A D Fox, H Boyd, and D A Stroud. 1999. “Variation in the Belly Barrings of the Greenland White-Fronted Goose Anser Albifrons Flavirostris”. Wildfowl, January, 21-28. https://tidsskrift.dk/Wildfowl/article/view/154587.