1. I. A. Aksay, F. F. Lange andB. I. Davis,J. Amer. Ceram. Soc. 66 (1983) C-190.
2. F. F. Lange,ibid. 72 (1989) 3.
3. M. N. Rahaman, Y. Boiteux andL. C. Jonghe,Amer. Ceram. Soc. Bull. 65 (1986) 1171.
4. M. J. Crimp, R. E. Johnson, J. W. Halloran andD. L. Feke, in ?Science of ceramic chemical processing?, edited by L. L. Hench and D. R. Ulrich (John Wiley, New York, 1986) p. 539.
5. P. Greil, in ?Ceramic materials research?, edited by R. J. Brook (Elsevier, Amsterdam, 1989) p. 27.