1. J. Davidovits, Darstellung und Strukturuntersuchung von Diol-oligo-urethanen einheitlicher Molekügrösse, Dr. rer. nat. Thesis, University of Mainz, Germany, 1960.
2. J. Davidovits, Transfer and Exploitation of Scientific and Technical Information, EUR 7716, Commission of the European Communities, Luxembourg 1982, p. 316.
3. R. M. Barrer, Trans. Brit. Ceramic. Soc., 56 (1957) 155.
4. D. W. Breck, Zeolite Molecular Sieves, J. Wiley & Son ed., New York 1974.
5. J. Davidovits, SPE PACTEC '79, Society of Plastic Engineers, Brookfield Center, USA 1979, p. 151.