Marchant, B. P. and Lark, R. M. 2007. Optimized sample schemes for geostatistical surveys. Mathematical geology. 39, pp. 113-134. https://doi.org/10.1007/s11004-006-9069-1
Bosch, E. H., Oliver, M. A. and Webster, R. 2004. Wavelets and the generalization of the variogram. Mathematical geology. 36 (2), pp. 147-186. https://doi.org/10.1023/B:MATG.0000020469.51320.5d
Oliver, M. A. and Webster, R. 1989. A geostatistical basis for spatial weighting in multivariate classification. Mathematical geology. 21 (1), pp. 15-35. https://doi.org/10.1007/BF00897238