1. Nitrogen Ceramics. Ed. F.L. Riley, Noordhoff International Publishing, Leyden (1977).
2. P. Popper, ibid. pp. 3–22.
3. R.J. Brook, ibid. pp. 671–674.
4. Ceramics for High Performance Applications II. eds. J.J. Burke, E.M. Lenoe and R.N. Katz, Brook Hill Publishing Co., Chestnut Hill, MA. (1978).
5. Keramische Komponenten fur Fahrzeug-Gasturbinen. W. Bunk and M. Bohmer, eds., Springer-Verlag, Berlin (1973).