Ability of navigated 3D ultrasound to delineate gliomas and metastases-comparison of image interpretations with histopathology. - Unsgaard,G.; Selbekk,T.; Brostrup Muller,T.; Ommedal,S.; Torp,SH.; Myhr,G.; Bang,J.; Nagelhus Hernes,TA. (Acta Neurochir (Wien), 2005)