1. G. Steinleitner, Proceedings of the D.V.S. Conference, ?Fügen von Keramic, Glas und Metall?, Baden-Baden, December, 1980 (DVS (German Welding Society), Dusseldorf, 1981) p. 100.
2. C. F. Old andM. G. Nicholas, unpublished work (1977).
3. W. Dawihl andE. Klinger,Ber. Dtsch. Keram. Ges. 46 (1969) 12.
4. G. Heidt andG. Heimke,ibid. 50 (1973) 303.
5. J. Klomp,Sci. Ceram. 5 (1970) 501.