Pierre Alliez Nathalie Laurent Henri Sanson Francis J. M. Schmitt Efficient view-dependent refinement of 3D meshes using sqrt{3}-subdivision. 205-221 2003 19 The Visual Computer 4 http://dx.doi.org/10.1007/s00371-002-0165-z db/journals/vc/vc19.html#AlliezLSS03