3733 2009 2009 eng 863 870 3 28 article 0 -- -- -- Hierarchical Vortex Regions in Swirling Flow Computer Graphics Forum yes Christoph Petz Jens Kasten Steffen Prohaska Hans-Christian Hege Visual Data Analysis Visual Data Analysis in Science and Engineering Image Analysis in Biology and Materials Science Hege, Hans-Christian Prohaska, Steffen FLOW-VIS Visual and Data-centric Computing