1. Computer description of topography;Grender;Virginia Jour. Science,1971
2. Point-association of geologic parameters—a quantitative basis for comparison;Grender,1968
3. The possibility of studying landforms by means of digital computers;Greysukh;Soviet Geography,1966
4. Detection of surface-specific points by local parallel processing of discrete terrain elevation data;Peucker;U.S. Air Force Office of Scientific Research, Tech. Rept. TR-206,1972
5. Parametric description of land form, in Land Evaluation;Speight,1968