Christian Tietjen Roland Pfisterer Alexandra Baer Rocco Gasteiger Bernhard Preim Hardware-Accelerated Illustrative Medical Surface Visualization with Extended Shading Maps. 166-177 2008 Smart Graphics http://dx.doi.org/10.1007/978-3-540-85412-8_15 conf/sg/2008 db/conf/sg/sg2008.html#TietjenPBGP08