1. Zeolites and Clay Minerals as Sorbents and Molecular Sieves;Barrer,1978
2. Zeolite Molecular Sieves;Breck,1973
3. Synthetic Zeolites, Parts 1 and 2;Zhdanov,1990
4. Gas Separation by Adsorption Processes;Yang,1986
5. R.M. Milton, US Patent No. 2 882 243 (1953)