1. Asch, W., and Asch, D.: Silicates in Chemistry and Industry, London: Constable & Co. Ltd., 1913, pp 199-236.
2. Pulp Reactions to Dental Cements
3. Skinner, E.W., and Phillips, R.W.: The Science of Dental Materials, 6th ed. Philadelphia : W. B. Saunders Co. , 1967, p 508.