1. V. L. Zholobenko, L. M. Kustov, and V. B. Kazanskii, Kinet. Katal. 30, 901 (1989).
2. V. L. Zholobenko, L. M. Kustov, and V. B. Kazanskii, in Proceedings of the 4th All-Union Conference on Zeolites (Moscow, 1989), p. 33.
3. V. L. Zholobenko, L. M. Kustov, and V. B. Kazansky, in Proceedings of the 9th International Conference on Zeolites (Butterworth, Montreal, 1992), p. 299.
4. M. Das and S. Basu, Spectrochim. Acta 71, 897 (1961).
5. H.-H. Perkampus and Th. Kranz, Z. Phys. Chem. 34, 213 (1962).