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2. M. ATTREP Jr., MS thesis, University of Arkansas, USA, (1962).
3. T.M. BEASLEY, H.V. LORZ, In “Technetium in the Environment,” Eds. G. Desmet and C. Myttenaere, Elsevier Applied Science Publishers, (1986) p. 197.
4. F. LUYKX Ibid. In “Technetium in the Environment,” Eds. G. Desmet and C. Myttenaere, Elsevier Applied Science Publishers, (1986). P. 21.
5. J. RIOSECO, PhD thesis, University of Lund, Sweden, (1987).