1. 1. Gregg, S. J. & Sing, K. S. W. Adsorption, Surface Area and Porosity (Academic, London, 1982). 2. Evans, R. in Liquides aux Interface/Liquids at Interfaces (eds Charvolin, J., Joanny, J. F. & Zinn-Justin, J.) Les Houches, Session XLVIII, 1-98,1988 (North-Holland, Amsterdam, 1990). 3. Stach, H., Lohse, U., Thamm, H. & Schirmer, W. Zeo//tes 6, 74-90 (1986). 4. Richard, R. E. & Rees, L. V. C. Langmuir 3, 335-340 (1987). 5. Janchen, J. & Stach, H. Z. Chem. 24, 158-159 (1984). 6. Dubinin, M. M., Rakhmatkariev, G. U. & Isirikyan, A. A. Izv. Akad. Nauk SSSR, Ser. Khim. 10, 2333-2335 (1989). 7. Maxwell, I. E. & Stork, W. H. J. in Introduction to Zeolite Science and Practice (eds Bekkum, H. v., Flaningen, E. M. & Jansen, J. C.) 571-630 (Stud, in Surf. Sci. and Catalysis, Vol. 58, Elsevier, Amsterdam, 1991). 8. Haag, W. 0. in Zeolites and Related Microporous Materials: State of the Art 1994 (eds Weitkamp, J., Karge, H. G., Pfeifer, H. & Holderich, W.) 1375-1394 (Stud. Surf. Sci. Catalysis, Vol. 84, Elsevier, Amsterdam, 1994). 9. Feynman, R. P. Statistical Mechanics (Benjamin, Reading, MA, 1972). 10. Frenkel, D. in Proc. 97th. Int. 'Enrico Fermi' School of Physics (eds Ciccotti, G. & Hoover, W. G.) 151-188 (North Holland, Amsterdam, 1986). 11. Harris, J. & Rice, S. A. J. chem. Phys. 89, 5898-5908 (1988). 12. Siepmann, J. I. & Frenkel, D. Molec. Phys. 75, 59-70 (1992). 13. Frenkel, D., Mooij, G. C. A. M. & Smit, B. J. Phys. Condens. Matter 4, 3053-3076 (1992). 14. Smit, B. & Siepmann, J. I. J. phys. Chem. 98, 8442-8452 (1994). 15. Smit, B. Molec. Phys. (in the press). 16. Siepmann, J. I., Karaborni, S. & Smit, B. Nature 365, 330-332 (1993). 17. Lohse, U., Thamm, H., Noack, M. & Fahlke, B. J. Incl. Phenom. 5, 307-313 (1987). 18. Abdul-Rehman, H. B., Hasanain, M. A. & Loughlin, K. F. Ind. Eng. Chem. Res. 29, 1525-1535 (1990). 19. Rakhmatkariev, G. U., Zhalalov, Kh. R. & Akhmedov, K. S. Uzbek. Khim. Zh. 3, 68-70 (1988). 20. Zangwill, A. Physics at Surfaces Ch. 11 (Cambridge University Press, Cambridge, 1988).