1. ISO (1978 ) International Standard 1563: Alginate Impression Materials . Ref. no. ISO 1563-1978 (E). International Organization of Standardization, Switzerland.
2. M.W. John(1971 ) Statistical Design and Analysis of Experiments , p.91 . Macmillan, London.
3. R.G. Miller(1966 ) Simultaneous Statistical Inference , pp.42 , 42 . McGraw-Hill, New York.
4. Compatibility of alginate impression materials and dental stones