1. 1. Øgaard B, Rölla G, Cruz R. Fluoride dentifrices - a possible cariostatic mechanism. In: Embery G, Rölla G (eds). Clinical and biological aspects of dentifrices. Oxford University press, Oxford, UK, 1992, pp. 305 - 12.
2. 2. Rölla G, Øgaard B. Reduction in caries incidence in Norway from 1970 to 1984 and some considerations concerning the reasons for this phenomenon. In Frank RM and O''Hickey S (eds): Strategy for dental caries prevention in European countries according to their laws and regulations. IRL Press Ltd, Oxford, England 1987, pp 223 - 229.
3. 3. Marthaler TM. Changes in dental caries 1953 - 2003. Caries Res. 2004: 38; 173 - 181.
4. 4. Alkali metal monofluorophosphate and calcium carbonate dentifrice. United States Patent number 3,119,443, 1964. Patenteier: Sten Yngve Ericsson.
5. 5. Arnold FA Jr, Likins RC, Russell AL, Scott DB. Fifteenth year of Grand Rapids fluoridation study. J Am Dent Assoc. 1962; 65: 780 - 785.