Etzelmüller , Bernd, Geir Vatne, Rune S. Ødegård, and Johan Ludvig Sollid. 1993. “Mass Balance and Changes of Surface Slope, Crevasse and Flow Pattern of Erikbreen, Northern Spitsbergen: An Application of a Geographical Information System (GIS)”. Polar Research 12 (2):131-46. https://doi.org/10.3402/polar.v12i2.6709.