1. Chemistry of Zeolites and Catalysis on Zeolites [Russian translation], J. Rabo, ed., Vol. 1, Mir, Moscow (1980).
2. A. L. Klyachko, A. D. Rukhadze, G. I. Kapustin, et al., ?Calorimetric study of the acidity of zeolites,? in: Use of Zeolites in Catalysis, Second All-Union Conference [in Russian], Moscow (1981), pp. 11?14.
3. D. Barthomeuf and R. Beaumont, ?Modification of acidity of Y zeolites by extraction of aluminum? [in French], C. R. Acad. Sci. Paris, Sec. C,269, 1345?1347 (1969).
4. A. Bielanski, J. Berac, J. Datca, and A. Drelinkiewicz, ?The strength of Brönsted acid sites in aluminum deficient NaHY zeolites,? Bull. Acad. Pol. Sci., Ser. Sci. Chim.,23, No. 5 (1975).
5. E. A. Stepanova, V. S. Komarov, and N. A. Akulich, ?Simultaneous IR spectroscopic and gravimetric determination of sorption of pyridine by oxide catalysts,? Zh. Prikl. Spektrosk.,31, No. 6, 1023?1029 (1979).