Fusion of MR and CT scans of the pelvis in cases of malignant bone tumors. - Wolfgang Birkfellner; Eva Schwameis; Friedrich Vorbeck; Rudolf Hanel; Wolfgang Greimel; Johann Hummel; Michael Figl; Franz Kainberger; Herwig Imhof; Rainer Kotz; Helmar Bergmann (CARS, 2001)

A Head-Mounted Operating Binocular for Augmented Reality Visualization in Medicine - Design and Initial Evaluation. - Wolfgang Birkfellner; Michael Figl; Klaus Huber; Franz Watzinger; Felix Wanschitz; Johann Hummel; Rudolf Hanel; Wolfgang Greimel; Peter Homolka; Rolf Ewers; Helmar Bergmann (IEEE Trans. Medical Imaging, 2002)