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2. S. R. Wullstein(1979 ) Keramik und Humankleber beim Aufbau der Tympanoplastik . 50th Annual Meeting of the German Society for ENT, Berlin.
3. R. Reck, J. Bromer, and K. K. Deutscher(1979 ) Application of bioactive glass ceramic: clinical and histological findings . Midwinter Research Meeting of the Association for Research in Otolaryngology, St Petersburg, Florida.