1. Abhandlung von der Zahnen des menschilchen Korpers und deren Erkrankungen;Pfaff,1756
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3. Ultrasonic root end preparation;Carr;Dent Clinics North Am,1997
4. Retreatment of endodontic fillings;Bergenholtz;Scand J Dent Res,1979
5. Retrograde approaches in endodontic therapy;Friedman;Endod Dent Traumatol,1991