Michael Figl Wolfgang Birkfellner Franz Watzinger Felix Wanschitz Johann Hummel Rudolf Hanel Rolf Ewers Helmar Bergmann PC-Based Control Unit for a Head Mounted Operating Microscope for Augmented Reality Visualization in Surgical Navigation. 44-51 2002 conf/miccai/2002-2 MICCAI (2) http://link.springer.de/link/service/series/0558/bibs/2489/24890044.htm db/conf/miccai/miccai2002-2.html#FiglBWWHHEB02