1. W. H. GITZEN, in “Alumina as a Ceramic Material”, (The American Ceramic Society, Columbus, Ohio, 1970).
2. E. DOERRE and H. HUEBNER, in “Alumina: Processing and Applications”, (Springer, Berlin, 1984).
3. R. J. BROOK, S. P. HOWLETT and SU XING WU, in: “Sintering – Theory and Practice”, (Elsevier, The Netherlands, 1982).
4. R. J. BROOK, Am. Ceram. Soc. Bull 64 (1985) 1344.
5. H. P. CAHOON and C. J. CHRISTENSEN, ibid. 39 (1956) 337.