1. Randomness in geomorphological process models;Ahnert,1994
2. The development of a system of terrain evaluation over large areas;Beckett;R. Eng. J.,1971
3. Optimal sampling strategies for mapping soil types: I. Distribution of boundary spacings;Burgess;J. Soil Sci.,1984
4. Optimal interpolation and isarithmic mapping of soil properties: IV. Sampling strategy;Burgess;J. Soil Sci.,1981
5. Chaos;Gleick,1988