@InProceedings{jue:10k,
  author = 	 {X. Song and B. J\"uttler and A. Poteaux},
  title = 	 {Hierarchical Spline Approximation of the Signed 
                  Distance Function (extended abstract)},
  booktitle =    {Proc. Int. Conf. on Shape Modeling and Applications},
  year = 	 {2010},
  organization = {IEEE},
  pages = {241-245}}