1. Bogue, R. H., The Chemistry of Portland Cement, 463 (Reinhold Publishing Corporation, New York, 1955).
2. Bernal, J. D., Proc. Third Intern. Symp. on Chemistry of Cement, 258 (C. and C.A., London, 1952).
3. Jeffery, J. W., Chem. Indust., 53, 1756 (1955).
4. Cottrell, A. H., Proc. Roy. Soc., A, 276, 1 (1963).
5. Chatterji, S., and Jeffery, J. W., J. Amer. Ceram. Soc., 46, 187 (1963); Mag. Conc. Res., 16, 3 (1964).