@article{DupDam09,
  author = {Dupas, A. and Damiand, G.},
  title = {Region Merging with Topological Control},
  journal = {Discrete Applied Mathematics},
  editor = {Elsevier},
  volume = {157},
  issue = {16},
  pages = {3435--3446},
  year = {2009},
  month = {August},
  url = {http://dx.doi.org/10.1016/j.dam.2009.04.005},
  keywords = {Topological map, Topological constraint, Betti numbers, Segmentation}
}