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David, M., 1972, Grade–tonnage curves: use and misuse in ore-reserve estimation; Trans. Inst. Min. Metall., Sect. A, pp. A129–A132
Huijbregts, C., 1976, Selection and grade–tonnage relations; in Guarascio, M., et al. (eds.), Advanced geostatistics in the mining industry, pp. 113–135, D. Reidel Pub. Co., Dordrecht, the Netherlands