1. H. SCHMALZRIED, ?Solid State Reactions? 2nd edn. (Verlag Chemie, Weinheim 1981) pp. 105?108.
2. I. TEOREANU and N. CIOCEA,Mater. Constr. (Bukarest) 6 (1976) 17.
3. T. ISEKI, K. YAMAGUCHI and H. TAGAI,J. Amer. Ceram. Soc. 69 (1970) 425.
4. V. BULKOV and K. BOYADZHIEVA,Stroit. Mater. Silik. Prom. 13 (1972) 3.
5. O. HENNING,Wiss. Z. Hoch. Archit. Bauwesen 3 (1968) 315.