Ko-Foa Tchon Mohammed Khachan François Guibault Ricardo Camarero Constructing Anisotropic Geometric Metrics using Octrees and Skeletons. 293-304 2003 IMR http://www.andrew.cmu.edu/user/sowen/abstracts/Tc987.html db/conf/imr/imr2003.html#TchonKGC03