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2. Markov schemes for multivariate well data;Agterberg;Penn. State Univ., Mineral Ind. Expt. Sta., Spec. Publ.,1966
3. Computer techniques in geology;Agterberg;Earth-Sci. Rev.,1967
4. The lognormal distribution of the elements, I;Ahrens;Geochim. Cosmochim. Acta,1954
5. The lognormal-type distribution of the elements, II;Ahrens;Geochim. Cosmochim. Acta,1954