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4. The role of bleeding upon probing in the diagnosis of periodontal disease. A literature review. Greenstein G. J Periodontol; 1984 Dec; 55(12):684-8. PubMed ID: 6394735 [Abstract] [Full Text] [Related]
5. Proceedings of the workshop on quantitative evaluation of periodontal diseases by physical measurement techniques. Parakkal PF. J Dent Res; 1979 Feb; 58(2):547-53. PubMed ID: 368091 [Abstract] [Full Text] [Related]
6. Periodontal diagnosis. Current status and future needs. Polson AM, Goodson JM. J Periodontol; 1985 Jan; 56(1):25-34. PubMed ID: 3882931 [Abstract] [Full Text] [Related]