[1] [2] 
 NPR, Focussing and Emphasis in Medical Visualizations
Bernhard Preim, Christian Tietjen, Christina Dörge.
In Simulation und Visualisierung 2005. SCS, 
2005.  [BibTeX]
 Real-Time Illustration of Vascular Structures
Felix Ritter, Christian Hansen, Volker Dicken, Olaf Konrad-Verse, Bernhard Preim, Heinz-Otto Peitgen.
IEEE Transactions on Visualization and Computer Graphics, Vol. 12, No. 5, pp. 877--884, 
2006.  [BibTeX]
 Using a 3D Puzzle as a Metaphor for Learning Spatial Relations
Felix Ritter, Bernhard Preim, Oliver Deussen, Thomas Strothotte.
Graphics Interface (GI'00), Montreal, 15-17 May, 
2000.  [BibTeX]
 Visualization in Medicine: Theory, Algorithms, and Applications
Bernhard Preim, Dirk Bartz.
Morgan Kaufmann, 
2007.  [BibTeX]