Rotation invariance principles in 2D/3D registration. - Wolfgang Birkfellner; Joachim Wirth; Wolfgang Burgstaller; Bernard Baumann; Harald Staedele; Beat Hammer; Nils-Claudius Gellrich; Augustinus Ludwig Jacob; Pietro Regazzoni; Peter Messmer (Image-Guided Procedures, 2003)

A Method for Assessing 3D Shape Variations of Fuzzy Regions and its Application on Human Bony Orbits. - Hansrudi Noser; Beat Hammer; Lukas Kamer (J. Digit. Imaging, 2010)