1. T. Sakurai, T. Sato and A. Yoshinaga, in Proceedings of the 5th International Symposium on the Chemistry of Cement, Tokyo Vol. 1 (Cement Association of Japan, 1968) p. 300.
2. W. Kurdowski and A. Szummer, Silicates Ind. 33(6) (1968) 183.
3. V. E. Kaushanskii, Y. M. Butt and V. V. Timashev, Tr. Mosk. Khim Tekhnol Inst. 50 (1966) 92.
4. K. E. Fletcher, Trans. Brit. Ceram. Soc. 64(8) (1965) 377.
5. N. A. Toropve, in Proceedings of the 5th International Symposium on the Chemistry of Cement, Tokyo (Cement Association of Japan, 1968) p. 49.