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  editor     = {Kneer, F. and Puschmann, K.G. and Wittmann, A.D.},
  keywords   = {Inversions},
  pages      = {287--296},
  publisher  = {Universit{\"a}tsverlag G{\"o}ttingen},
  title      = {Inversion techniques: From observations to atmospheres},
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@article{beck2010,
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  adsurl   = {http://adsabs.harvard.edu/abs/2007PhDT........27C},
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  school   = {Universidad de Granada},
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  year     = {2007}
}
@article{dani2008,
  adsurl        = {http://adsabs.harvard.edu/abs/2008A&A...477..273C},
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  keywords = {Photosphere, Sunspots, Spectroscopy},
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  year     = {2009}
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  keywords = {Sunspots, Magnetic fields},
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@article{Marquez2006,
  adsurl        = {http://adsabs.harvard.edu/abs/2006ApJ...638..553M},
  archiveprefix = {arXiv},
  author        = {M{\'{a}}rquez, I. and S{\'{a}}nchez Almeida, J. and Bonet, J.A.},
  doi           = {10.1086/498668},
  eprint        = {astro-ph/0510220},
  journal       = {Astrophys. J.},
  keywords      = {Convection, Magnetic fields, Sunspots},
  pages         = {553--563},
  title         = {High-Resolution Proper Motions in a Sunspot Penumbra},
  volume        = {638},
  year          = {2006}
}