1. British Dental Association Museum. http://www.bda-dentistry.org.uk/museum/story.cfm?.
2. British Patent 3028;Fletcher,1878
3. German Patent 8202;Fletcher,1879
4. Dental silicate cements. I. The chemistry of erosion;Wilson;J Dent Res,1967
5. Clinical relevance of physical, chemical, and bonding properties of composite resins;Asmussen;Oper Dent,1985