Bruno Jobard and Wilfrid Lefer: -- "Creating Evenly Spaced Streamlines of Arbitrary Density", Visualization in Scientific Computing '97, Springer Vienna, 1997
William Schroeder and Ken Martin and Bill Lorensen: -- "Vector Algorithms", chapter 6.3 in "The Visualization Toolkit", pp.161 - 168, Kitware, Inc., 2002
