1. EPA 600/4-84-012;K. W. Brown,1984
2. Brown, K. W. and Black, S. C.: 1983, ‘Quality Assurance and Quality Control Data Validation Procedures Used for the Love Canal and Dallas Lead Soil Monitoring Programs’, Environmental Monitoring and Assessment
3, 113–122.
3. David, M.: 1977, Geostatistical Ore Reserve Estimation, Elsevier Scientific Publishing Company. Amsterdam Oxford, New York. 1977.
4. Davis, J. C.: 1973, Statistics and Data Analysis in Geology, John Wiley and Sons Inc. New York.
5. Journel, A. G. and Huybregts, Ch. J.: 1978, Mining Geostatistics, Academia Press. London and New York.