Rémi Allègre Aurélien Barbier Eric Galin Samir Akkouche A Hybrid Shape Representation for Free-Form Modelling. 7-18 2004 conf/smi/2004 SMI http://doi.ieeecomputersociety.org/10.1109/SMI.2004.5 db/conf/smi/smi2004.html#AllegreBGA04