Planning and controlling minimal invasive operations by real-time direct volume rendering - Gröpl, Alexander; Günther, Thomas; Hesser, Jürgen; Männer, Reinhard; Messer, H.; Poliwoda, Christoph; Reinhart, Christof; Jäger, Willi; Wirth, Johannes; Haßfeld, Stefan (CAR '96, Computer assisted radiology, 1996)