1. Patel, R. G., Parrott, L. J., Martin, J. A. and Killoh, D. C.,Cement Concr., Res. 15 (2) (1985) 343–356.
2. Powers, T. C.Proc. Highways Research Board, Washington D. C. 27 (1947) 178–188.
3. Spears, R. E.,Concr. Int. 5 (April 1983) 15–18.
4. Parrott, L. J. and Killoh, D. C.,Proc. Brt. Ceram. Soc. No. 35 (1984) 41–53.
5. Gutteridge, W. A.,, No. 35 (1984) 11–23.