Savage, Amir; Eaton, Kenneth A.; Moles, David R.; Needleman, Ian (2009). "A systematic review of definitions of periodontitis and methods that have been used to identify this disease". Journal of Clinical Periodontology. 36 (6): 458–467. doi:10.1111/j.1600-051X.2009.01408.x. PMID19508246.
nih.gov
pubmed.ncbi.nlm.nih.gov
Savage, Amir; Eaton, Kenneth A.; Moles, David R.; Needleman, Ian (2009). "A systematic review of definitions of periodontitis and methods that have been used to identify this disease". Journal of Clinical Periodontology. 36 (6): 458–467. doi:10.1111/j.1600-051X.2009.01408.x. PMID19508246.