1. Distribution of Elements in Our Planet;Ahrens,1965
2. Information theory and an extension of maximum likelihood principle;Akaike,1973
3. Outliers in Statistical Data;Barnett,1994
4. Estimation of non-ergodic variograms and their sampling variance by design-based sampling strategies;Brus;Math. Geol.,1994
5. Optimal interpolation and isarithmic mapping of soil properties;Burgess;I. The semi-variogram and punctual kriging. J. Soil Sci.,1980