Eric Landreneau Ergun Akleman Vinod Srinivasan Local Mesh Operators: Extrusions Revisited. 351-356 2005 conf/smi/2005 SMI http://doi.ieeecomputersociety.org/10.1109/SMI.2005.26 db/conf/smi/smi2005.html#LandreneauAS05