Moseley , G. E., J. Rosvold, A. B. Gotfredsen, I. Hajdas, O. Gilg, K. M. Gregersen, C. Spötl, and R. L. Edwards. “First Pre-Modern Record of the Gyrfalcon (Falco Rusticolus) in North-East Greenland”. Polar Research, vol. 38, Dec. 2019, doi:10.33265/polar.v38.3539.