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Tobias Schafhitzel Eduardo Tejada Daniel Weiskopf Thomas Ertl Point-based stream surfaces and path surfaces. 289-296 2007 conf/graphicsinterface/2007 Graphics Interface http://doi.acm.org/10.1145/1268517.1268564 db/conf/graphicsinterface/graphicsinterface2007.html#SchafhitzelTWE07