1. Problems and proposals for recording gingivitis and plaque;Ainamo;Int. Dent. J.,1975
2. An assessment of the inter- and intra-examiner agreement in scoring gingivitis clinically;Alexander;J. Periodont. Res.,1971
3. Evaluation of a training program for the PMA and the Gingival Index;Alexander;J. Periodont. Res.,1972
4. The origin of gingival fluid;Alfano;J. Theor. Biol.,1974
5. Graping indexes reduces plaque;Barrickman;J. Am. Dent. Assoc.,1973