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3. D.E.W. Vaughan, in: L.B. Sand, F.A. Mumpton (Eds.), Properties of Natural Zeolites: Natural Zeolite Occurrence, Properties, Uses, Pergamon Press, New York, 1978, pp. 353–371
4. R.M. Barrer, Zeolites and Clay Minerals as Sorbents and Molecular Sieves, Academic Press, London, 1978, pp. 1–22