1. A Sopkov� and M. ?ingliar in: J. L. Atwood, J. E. D. Davies and D. D. MacNicol (eds.)Inclusion Compounds Vol. 3, p. 245 (1984), Academic Press, London.
2. J. Bubanec: Dissertation, Chemical Faculty, Slovak Technical University, Bratislava (1986).
3. F. A. Mumpton:Clays and Clays Minerals 24, 1 (1976), Pergamon Press, London.
4. A. Sopkov� and J. Bubanec:Chem. prumysl. 38/63, 11 (1988).
5. Y Sasaki:Bull. Chem. Soc. Jpn. 42, 2412 (1969).