Maciej Dakowicz
and Christopher M. Gold
Proc. Int. Conf. Computational Science (ICCS 2002), part III, Lecture Notes in Computer Science 2331, Peter M. A. Sloot,
Chih Jeng Kenneth Tan,
Jack Dongarra,
and Alfons G. Hoekstra, ed., Springer-Verlag, 2002, pp. 144–153
http://www.voronoi.com/pdfs/2000-2003/Extracting_Meaningful_Slopes_from_Terrain_Contours.pdf
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