@techreport{WiebelPreisVosetal.2013, author = {Alexander Wiebel and Philipp Preis and Frans M. Vos and Hans-Christian Hege}, title = {Computation and Application of 3D Strokes on Visible Structures in Direct Volume Rendering}, institution = {ZIB}, address = {Takustr. 7, 14195 Berlin}, number = {13-20}, language = {eng}, year = {2013} }