Robot assisted craniofacial surgery: first clinical evaluation - Burghart, Catherina; Krempien, Robert; Redlich, Tilmann; Pernozzoli, Arno; Grabowski, Hartwig; Münchenberg, Jan; Albers, J.; Haßfeld, Stefan; Vahl, C.; Rembold, Ulrich; Wörn, Heinz (Computer assisted radiology and surgery, 1999)