1. EASE-Grid: a versatile set of equal-area projections and grids;Brodzik,2002
2. Brown, J., Jr., Heginbottom, J.A., Melnikov, E.S., 1998. Circum-Arctic map of permafrost and ground-ice conditions. Technical Report, National Snow and Ice Data Center/World Data Center for Glaciology. Digital Media.
3. Recent variations of sea ice and air temperature in high latitudes;Chapman;Bulletin of the American Meteorological Society,1993
4. Introduction to the Physics and Techniques of Remote Sensing;Elachi,1987
5. Food and Agriculture Organization/UNESCO, 1995. Digital Soil Map of the World and Derived Properties, version 3.5, November, 1995. Original scale 1:5,000000, UNESCO, Paris, France.