1. W. Mahler and U. Chowdhary, Morphological Consequences of Freezing Gels, inUltrastructure Processing of Ceramics, Glasses and Composites, edited by L.L. Hench and D.R. Ulrich (John-Wiley & Sons, New York, 1984), pp. 207–218.
2. J.D. Birchall, J.A.A. Bradbury, and J. Dinwoodie, Alumina Fibres: Preparation, Properties and Applications, in Hand book of Composites,Strong Fibres, edited by W. Watt and B.V. Perov (Elsevier, London, 1985), vol. 1, p. 150.
3. P. Bracke, H. Schurmans, and J. Verhoest,Inorganic Fibres and Composite Materials (Pergamon Press, Oxford, 1984), pp. 35–44.
4. T. Yoko, K. Kamiya, K. Tanaka, and H. Itoh, Conversion Process of Gel Fibres Prepared from Zr(O\nC9H7)4 by Sol-Gel method to ZrO2 Fibres, inProceedings of the International Institute for the Science of Sintering (IISS) Symposium, Tokyo, Sintering 87, edited by S. Somiya, M. Shimada, M. Yoshimura, and R. Watanabe (Elsevier Applied Science, London, 1988), vol. 1, pp. 96–101.
5. K. Kamiya, K. Tanimoto, and T. Yoko, J. Mat. Sci. Lett.5, 402–404 (1986).