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2. V. M. Vdovenko et al., At. Energ.,31, 4, 409 (1971).
3. R. M. Aleksakhin, Radioactive Contamination of Soil and Plants [in Russian], Izd-vo AN SSSR, Moscow (1963).
4. Radioactivity of Soils and Methods of Determining It [in Russian], Nauka, Moscow (1966).
5. H. M. Squire and L. J. Middleton, Report, ARCRL,10, 78 (1963).