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Abdul-Kadir, R. (1989) Assessment of periodontal diseases in epidemiological investigations: a critical review. Singapore Dental Journal, 14 (1). pp. 6-12. ISSN 0377-5291, DOI 2487478.
Awang, M.N. (1989) The aetiology of dry socket: a review. International Dental Journal, 39 (4). pp. 236-40. ISSN 0020-6539, DOI 2691403.