1. A. Dyer,An Introduction to Zeolite Molecular Sieves (Wiley, New York, 1988).
2. S. Bhatia,Zeolite Catalysis: Principles and Applications (CRC Press, Boca Raton, 1990).
3. D. Farcasiu, G. Miller, A. Ghenciu and H.S. Cao, 13th North American Meeting of the Catalysis Society, Pittsburgh, 2?6 May 1993.
4. Proc. 9th Int. Conf. on Positron Annihilation, Parts I?III, Szombathely 1991;Proc. 4th Int. Workshop on Positron and Positronium Chemistry, Le Mont Sainte-Odile 1993.
5. J. Lahtinen and A. Vehanen, Catal. Lett. 8 (1991) 67.