1. Principal requirements for controlled clinical trials;Dirks;Int. Dent. J,1967
2. Effect of topically applied fluorides on dental caries experience of children residing in fluoride areas;Downs;J. Dent. Child,1951
3. The use of fluoride dentifrices in the control of dental caries: methodology and results of a clinical trial;Fanning;Aust. Dent. J,1968
4. A comparative clinical study of three dentifrices;Finn;J. Dent. Child,1963
5. Report of a three-year clinical trial comparing a toothpaste containing sodium monofluorophosphate with two marketed products;Frankl;J. Oral Therap,1968