Image-Guided Neurosurgery Comparing a Pointer Device System with a Navigating Microscope: A Retrospective Analysis of 208 Cases - Roessler, K; Ungersboeck, K; Aichholzer, M; Dietrich, W; Czech, T; Heimberger, K; Matula, C; Koos, W T (min - Minimally Invasive Neurosurgery, 1998)