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Gehrig, . (2008). Fundamentals of Periodontal Instrumentation and advance Instrumentions 6th. Philadelphia: Lippincott Williams & Wilkins.
Gehrig, . 2008. Fundamentals of Periodontal Instrumentation and advance Instrumentions 6th. Philadelphia: Lippincott Williams & Wilkins.
Gehrig, . Fundamentals of Periodontal Instrumentation and advance Instrumentions 6th. Philadelphia: Lippincott Williams & Wilkins. 2008.