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2. Barrer, R.M. (1978) Zeolites and Clay Minerals as Sorbent and Molecular Sieves, Academic Press, New-York.
3. Cox, D.E. and Wilkinson, A.P. (1994) in Resonant Anomalous Diffraction X-ray Scattering, Materlik, G., Sparks, C.J. and Fischer, K., Eds., Elsevier Science B.V., Amsterdam, 195.