1. C. P. Mabie and D. L. Menis, J. Biomed. Mater. Res., 12, 435 (1978).
2. R. W. Phillips, Skinner’s Science of Dental Materials, 8th Ed., Igaku-Shoin/ Saunders, 1982.
3. R. G. Craig, Restorative Dental Materials, 8th Ed., CV Mosby, St. Louis, U.S.A., 1989.
4. D. F. Williams, Materials Science and Technology, Vol. 14, VCH, 1992.
5. Technical Product Profile, 3M Co., Lab., 70-2009-2054-7 (1998).