1. Gottardi G, Galli E. Natural zeolites. Berlin: Springer; 1985.
2. Breck DW. Zeolite molecular sieves: structure, chemistry, and use. New York: Wiley; 1974.
3. Breck DW. Potential uses of natural and synthetic zeolites in industry. In: Towsand RP, editor. The properties and application of zeolites. London: The Chemical Society; 1980. p. 391–422.
4. Tsitsishvili G, Andronikashvili T, Kirov G, Filizova L. Natural zeolites. New York: Ellis Horwood; 1992.
5. Mumpton FA. Clinoptilolite redefined. Am Min. 1960;45:351–69.