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2. Oral microbiology and infectious disease;Burnett,1962
3. Report of an expert committee on dental health. Technical report series No. 207;World Health Organization on periodontal disease,1961
4. Biochemistry of periodontal disease;Schultz-Haudt;Internat. D. J.,1962
5. Outline of a theory of periodontal disease;Rosebury;Washington D. J.,1955