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2. TAI-IL MAH and K. S. MAZDIYASNI, ibid.66 (1983) 699.
3. P. BOCH, T. CHARTIER and P. D. D. RODRIGO, in ?Ceramic transactions?, Vol. 6: ?Mullite and mullite matrix composite?, edited by S. Somiya, R. F. Davis and J. A. Pask (American Ceramics Society, Westerville, Ohio, 1990) p. 353.
4. S. KANZAKI, T. KUMAZAWA, J. ASAUMI, O. ABE and H. TABATA,Yogyo-Kyoshai-Shi 93 (1985) 407.
5. S. KANZAKI, O. ABE, M. ONASHI and H. TABATA, in ?Ceramic materials and components for engines?, edited by W. Bunk and H. Hausner (Deutsche Keramische Geselleschaft, Bad Honnef, 1986) p. 625.