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2. A. Aksay, D. M. Dabbs and M. Sarikaya, ibid.
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3. M. D. Sacks, H. W. Lee and J. A. Pask, in “Ceramic Tranactions”, Vol. 6, “Mullite and Mullite Matrix Composites”, edited by S. Somiya, R. E. Davis and J. A. Pask (1990) p. 167.
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5. H. Suzuki, H. Saito, Y. Tomokiyo and Y. Suyame, in “Ceramic Transactions”, Vol. 6, edited by S. Somiya, R. E. Davis and J. A. Pask (1990) p. 263.