Etzelmüller B., Vatne G., Ødegård R. S. and Sollid J. L. (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), pp. 131-146. doi: 10.3402/polar.v12i2.6709.