1. G. Gottardi, E. Galli, Natural Zeolites (Springer-Verlag, Berlin 1985.)
2. J. Weitkamp: Proc. Ninth Int. Zeolite Conference; Van Ballmoos, Higgins end Treacy eds.; Butterworth-Heinemann: London 1992, pp. 13–46.
3. G. A. Ozin, A. Kuperman, A. Stein, Angew. Chem. Int. Ed. Engl. 28, 359 (1989).
4. C. R. A. Catlow, Modelling of Structure and Reactivity in Zeolites (Academic Press Limited, San Diego, 1992).
5. R. Car, M. Parrinello, Phys. Rev. Lett. 55, 2471 (1985).