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3. S.P. Zhdanov, S.S. Khvoshchev, N.N. Feoktistova, Synthesic Zeolites, Vol. II, Institute of Silicate Chemistry, USSR Academy of Science, Leningrad, 1990.
4. The crystal structure of dehydrated NaX
5. Reinvestigation of the crystal structure of the zeolite hydrated NaX