1. Sorel, S. T., C.R. Acad. Sci., Paris, 65, 102 (1867).
2. Fink, G. J., Kirk-Othmer Encyclopedia of Chemical Technology, 3, 435 (1953). Taylor, H. F. W., The Chemistry of Cements (Academic Press, New York, 1964).
3. See Bacon, R., in Growth and Perfection of Crystals, edit. by Doremus, R. H., 197 (Wiley, New York, 1958). Nabarro, F. R. N., and Jackson, P. J., ibid., 77.
4. DeWolff, P. M., and Walter-Levy, L., Acta Cryst., 6, 40 (1953).
5. Brunauer, S., and Copeland, L. E., Sci. Amer., 210, No. 4, 81 (1964).