1. F. M. Lea, ?The Chemistry of Cement and Concrete? (Edward Arnold, London, 1970) p. 102.
2. A. Grudemo in ?The Chemistry of Cements? Vol. 1, edited by H. F. W. Taylor (Academic Press, London 1964) p. 371.
3. J. A. Gard in ?The Chemistry of Cements? Vol. 2, edited by H. F. W. Taylor (Academic Press, London, 1964) p. 243.
4. D. D. Double, A. Hellawell and S. J. Perry, Proc. Roy. Soc. A359 (1978) 435.
5. D. J. Clinton, Micron 3 (1972) 358.