King Lorenz et Hell Gunter, Photogrammetry and Geomorphology of High Arctic Push Moraines, Examples from Ellesmere Island, Canadian Arctic, and Spitsbergen, Svalbard Archipelago, Zeitschrift fur Geomorphologie. Supplementband Zeitschrift fur Geomorphologie. Supplement;Zeitschrift fur Geomorphologie. Supplementary issue Annals of geomorphology. Supplement;Annales de geomorphologie. Supplement, 92, 1993, pp. 21-38