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3. 3J. H. Taplin ; p.337 -48 in Ref. 2.
4. 4F. M. Lea , Chemistry of Cement and Concrete , 3d ed .; pp.240 -46 . Edward Arnold (Publishers) Ltd., London, 1970 .
5. 5I. M. Kolthoff, and P. J. Elving , Treatise on Analytical Chemistry , Vol. 1 , Part 2; p.86 . Wiley-Interscience, Inc., New York, 1961 .