1. Barnes, R. and Johnson, T., 1984, Positive kriging,in Geostat-Tahoe,* Part 1: Reidel, Dordrecht, p. 231?244.
2. Chiles, J. P., 1976, How to adapt kriging to nonclassical problems,in Guarascio et al., (Ed), Advanced Geostatistics in the Mining Industry: Reidel, Dordrecht, p. 80?89.
3. Davis, B., 1984, Indicator kriging as applied to an alluvial gold deposit,in Geostat-Tahoe,* Part 1: Reidel, Dordrecht, p. 337?348.
4. *Geostat-Tahoe refers to the two volumes proceedings of the 1983 NATO ASI ?Geostatistics for Natural Resources Characterization? G. Verly et al. (Eds.), published by Reidel, Dordrecht, 1984.
5. Isaaks, E. H., 1985, Risk qualified mappings for hazardous waste sites: A case study in distribution-free geostatistics, unpublished Master thesis, Stanford University, 85 p.