Glahder , C. M., A. D. Fox, M. O’Connell, M. Jespersen, and J. Madsen. “Eastward Moult Migration of Non-Breeding Pink-Footed Geese (Anser Brachyrhynchus) in Svalbard”. Polar Research, vol. 26, no. 1, Mar. 2007, pp. 31-36, doi:10.3402/polar.v26i1.6206.