Detlev Stalling Malte Zöckler Hans-Christian Hege Fast Display of Illuminated Field Lines. 118-128 1997 3 IEEE Trans. Vis. Comput. Graph. 2 http://www.computer.org/tvcg/tg1997/v0118abs.htm db/journals/tvcg/tvcg3.html#StallingZH97