1. Taylor, H. F. W. The Chemistry of Cements (Academic, London and New York, 1964).
2. Wyckoff, R. W. G. Crystal Structures 2nd edn, 4, 194 (Interscience, New York, London, Sydney and Toronto, 1968).
3. Jeffery, J. W. Acta crystallogr. 5, 26–35 (1952).
4. Czaya, R. Z. anorg. allg. Chem. 375, 124–7 (1970).
5. Treshnikov, E. N., Ilyukhin, V. V. & Belov, N. V. Doklady Acad. Nauk. U.S.S.R. 193, 1048–51 (1950).