Julien Lenoir Laurent Grisoni Philippe Meseure Yannick Rémion Christophe Chaillou Smooth constraints for spline variational modeling. 58-64 2004 conf/graphite/2004 GRAPHITE http://doi.acm.org/10.1145/988834.988844 db/conf/graphite/graphite2004.html#LenoirGMRC04