@article{BGG2007,
  title={Topology based selection and curation of level sets},
  author={Bajaj, C. and Gillette, A. and Goswami, S.},
  journal={Topology-Based Methods in Visualization II},
  pages={45--58},
  year={2009},
  publisher={Springer},
  editor={Hans-Christian Hege and Konrad Polthier and Gerik Scheuermann},
}