1. Minerals and Rocks, Natural Zeolites;Gottardi,1985
2. Natural Zeolites, Occurrence, Properties and Use;Sand,1978
3. Geologic Occurrence of Zeolites;Hay,1978
4. Geology of Natural Zeolites and Zeolitic Rocks;Iijima,1980
5. Synthesis of Molecular Sieve Zeolites, in: Molecular Sieves, London, England;Barrer,1968