1. Annels, A.E. (1992) Mineral Deposit Evaluation: A practical approach. Springer Science and Business Media, 436p.
2. David, M. (1977) Geostatistical Ore Reserve Estimation. Elsevier Scientific Publ., Amsterdam, Netherlands, 364p.
3. Elsevier (Developments in Geomathematics 6);M David,1988
4. Davis, B.M. and Borgman, L.E. (1979) A Test of Hypothesis Concerning a Proposed Model for the Underlying Variogram. Proc., 16th APCOM, pp.163–181.
5. Gandhi, S.M. and Sarkar, B.C. (2016) Essentials of Mineral Exploration and Evaluation. Elsevier, pp.289–303. DOI: https://doi.org/10.1016/C2015-0-04648-2