1. W. Lodding, Gas Effluent Analysis, Arnold, London, 1967.
2. A. Verdin, Gas Analysis Instrumentation, Macmillan, London, 1973.
3. M. H. Creer, J. C. B. Hardy, H. P. Rooksby andJ. E. Still, Clay Miner., 9 (1971) 19.
4. H. Lomas, Trans. Brit. Ceram. Soc., 65 (1966) 337.
5. C. J. Keattch, Analysis of Calcareous Materials, S.C.I. Monogr. no. 18, 1964, p. 279.