1. P. C. Maxwell,Amer. Ceram. Soc. Bull. 59 (1980) 1158.
2. W. M. Flock, in ?Ceramic Processing Before Firing?, edited by G. Y. Onoda and L. L. Hench, (John Wiley and Sons, New York, 1978) p. 31.
3. J. Pask,Amer. Ceram. Soc. Bu. 58 (1979) 1163 (1979 Edward Orton Jr Memorial Lecture).
4. See any classical text on thermodynamics; for instanceG. N. Lewis andM. Randall, ?Thermodynamics? 2nd edn (Mac Graw-Hill Book Company, New York, 1965).
5. I. Prigogine andI. Stengers, ?La Nouvelle Alliance?, (Editions Gallimard, 1979)