1. Pabst, R.F., Thesis, Univ. Stuttgart, 1972
2. Buresch, F.E., “Science of Ceramics”, Vol. 7, 383, 1973
3. Buresch, F.E., Pabst, R.F., “Science of Ceramics”, Vol. 6, XVI 13, 1973
4. Glucklich, J., Jet Propulsion Laboratory, TR 32-1438, Contract NAS 7-100, N 70-35917, 1970
5. Claussen, N., J. Am. Ceram. Soc. 59(1-2), 49–51, 1976