id: 70756902 dt: a an: 70756902 au: Birkfellner, Wolfgang; Watzinger, Franz; Wanschitz, Felix; Enislidis, Georg; Truppe, Michael; Ewers, Rolf; Bergmann, Helmar ti: Cocepts and results in the development of a hybrid tracking system for computer aided surgery so: MICCAI, 343-351 (1998). py: 1998 pu: la: EN cc: ut: ci: li: doi:10.1007/BFb0056218