1. Soils and Geomorphology;Birkeland,1984
2. Environmental reconstruction by electron microscopy;Bull;Progress in Physical Geography,1981
3. The origin and age of icy complex in the north of West Siberia;Danilov,1990
4. Particle fractionation and particle size analysis;Day,1965
5. Petrology of Sedimentary Rocks;Folk,1968