@article{FuhrmannSeehaferValori2007,
  author    = {Marcel Fuhrmann and Norbert Seehafer and Gherardo Valori},
  title     = {Preprocessing of solar vector magnetograms for force-free magnetic field extrapolation},
  doi       = {10.1051/0004-6361:20078454},
  url       = {http://www.aanda.org/},
  year      = {2007},
}