@INPROCEEDINGS{HPP05,
 author = {Klaus Hildebrandt and Konrad Polthier and Eike Preuss},
 title = {Evolution of 3d Curves under Strict Spatial Constraints},
 booktitle = {Proceedings of the Ninth International Conference on Computer Aided Design and Computer Graphics},
 year = {2005},
 pages = {40--45}
 }