References
----------

Watson, D. F., 1982, Acord: Automatic contouring of raw data, *Comp. &
Geosci.*, **8**, 97-101.

Shewchuk, J. R., 1996, Triangle: Engineering a 2D Quality Mesh Generator
and Delaunay Triangulator, First Workshop on Applied Computational
Geometry (Philadelphia, PA), 124-133, ACM, May 1996.

http://www.cs.cmu.edu/~quake/triangle.html