1. Natural Zeolites, Occurrence, Properties, Use;Mumpton,1978
2. Natural Zeolites: Occurrence, Properties, Uses of Natural Zeolites;Mumpton,1988
3. Occurrence of Clinoptilolite and Mordenite in Tertiary Calc-Alkaline Pyroclastites from Sardinia (Italy)
4. Zeolite Molecular Sieves;Breck,1974
5. Natural Zeolites;Gottardi,1985