1. Poröse Gläser, VEB Deutscher Verlag für Grundstoffindustrie, Leipzig 1982.
2. The Chemistry of Silica, Wiley, New York 1979.
3. For an excellent review of the state-of-the-art in classical zeolite science as of 1990 see (Eds.). Introduction to Zeolites, Science and Practice, Vol. 58 of Studies in Surface Science and Catalysis, Elsevier, Amsterdam 1991.
4. For the various aspects of the use of zeolite A as ion exchanger in detergents see in Detergents (Ed.: ), Springer, Berlin 1992.