@INPROCEEDINGS{Be09,
  author = {Berkels, Benjamin},
  title = {An unconstrained multiphase thresholding approach for image segmentation},
  booktitle = {Proceedings of the Second International Conference on Scale Space
	Methods and Variational Methods in Computer Vision (SSVM 2009)},
  year = {2009},
  volume = {5567},
  series = {Lecture Notes in Computer Science},
  pages = {26--37},
  publisher = {Springer},
  doi = {10.1007/978-3-642-02256-2_3},
  pdf = {http://numod.ins.uni-bonn.de/research/papers/public/Be09.pdf},
}