Jordi Esteve Pere Brunet Alvar Vinacua Approximation of a Variable Density Cloud of Points by Shrinking a Discrete Membrane. 791-807 2005 24 Comput. Graph. Forum 4 http://www.eg.org/EG/CGF/volume24/issue4/v24i4pp791-807.pdf db/journals/cgf/cgf24.html#EsteveBV05