author = {Rumpf, M. and Telea, A.},
  title = {A Continuous Skeletonization Method Based on Level Sets},
  booktitle = {Eurographics/IEEE TCVG Symposium on Visualization},
  year = {2002},
  pages = {151--157},
  abstract = {A robust and efficient method in 2D and 3D for the calculation of
	skeletons for arbitrary objects is presented. The method is based
	on the calculation of the distance function with respect to the object
	boundary. This is combined, in a post processing step, with a new
	indicator to identify the skeleton, which coincides with the singularity
	set of the distance map. The indicator is defined as a suitable function
	of certain local momenta of this distance map and allows a robust
	and accurate computation of the distance from the skeleton set. This
	distance is then extended, again via the level set method, onto the
	whole space. Several applications in 2D and 3D are presented.}