1. Barrer, R. M., and Davies, J. A., Proc. Roy. Soc., A, 320, 289 (1970).
2. Brauer, P., Lopatkin, A. A., and Stepanez, G. P., Second International Conf. Molecular Sieve Zeolites (Amer. Chem. Soc., Worcester, 1970).
3. Hill, T. L., Statistical Thermodynamics (Addison-Wesley, Reading, 1970).
4. Loughlin, K. F., thesis, Univ. New Brunswick (1970).
5. Handbook of Chemistry and Physics, 49th ed. (Chemical Rubber Company, Cleveland, 1968).