1. The prevalence of dental caries in Europe 1990–95;Marthaler;Caries Research,1996
2. Trends in caries prevalence in North American children;Burt;Int Dent J,1994
3. Changing trends in dental caries;Sheiham;Int J Epidemiol,1984
4. Oral health status of children and adults in Madagascar;Petersen;Int Dent J,1996
5. Oral health surveys – basic methods,1987