@inproceedings{TheiselSahnerWeinkaufetal.2005, author = {Holger Theisel and Jan Sahner and Tino Weinkauf and Hans-Christian Hege and Hans-Peter Seidel}, title = {Extraction of parallel vector surfaces in 3D time-dependent fields and application to vortex core line tracking}, booktitle = {Proc. IEEE Visualization 2005}, pages = {559 -- 566}, year = {2005}, }