Surgery on the lateral skull base with the navigated controlled drill employed for a mastoidectomy (pre clinical evaluation). - Hofer,M.; Grunert,R.; Dittrich,E.; Muller,E.; Mockel,M.; Koulechov,K.; Strauss,M.; Korb,W.; Schulz,T.; Dietz,A.; Luth,T.; Strauss,G. (Stud Health Technol Inform, 2007)