Meijering M.P.D. (1973) Zum vorkommen der Elfenbeinmowe Pagophila eburnea Phipps auf Spitzbergen im 17. Jahrhundert. ARDEA 61 (1-2): 128-130

On July 10th, 1671 Friderich Martens shot an Ivory Gull, Pagophila eburnea Phipps, near Langgrunnodden (Nordaustlandet, Spitsbergen) on 80¦43' N 17o40' E. This was very near the place, where Malmgren found the first colony of this species in Spitsbergen on July 7th, 1861.