1. British Standards Institution , 1952 :British Standard No. 1902, "Methods of testing refractory materials", p.35 .
2. British Standards Institution , 1952 : ibid, p.37 .
3. J. P. Clements, A. T. Green, and G. H. Stewart, 1953 : inCeramics-a Symposium (), p.731 , British Ceramic Society, Stoke-on-Trent.
4. F. H. Norton, 1949 : Refractories , 3rd Edition , p.484 , McGraw Hill, New York.
5. SOME EXPERIMENTS ON ROMANO-BRITISH COLOUR-COATED WARE