1. Groundwater flow systems and stream nets in the Netherlands;De Vries,1974
2. A geohydrologic study of East Gelderland (Netherlands);Ernst;Geol. Mijnbouw,1970
3. Erosional developments of streams and their drainage basins;Horton;Geol. Soc. Am. Bull.,1945
4. Throughflow, overland flow and erosion;Kirkby;Bull. Int. Assoc. Sci. Hydrol.,1967
5. Fluvial Processes in Geomorphology;Leopold,1964