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2. J. B. WACHTMAN and M. G. McLAREN,Adv. Mater. Technol. Monitor. 2 (1984) 25.
3. B. C. MUTSUDDY,Ind. Res. Dev. 25 (1983) 76.
4. M. J. EDIRISINGHE and J. R. G. EVANS,Int. J. High Tech. Ceram. 2 (1986) 1.
5. Idem, ibid. to be published.