@article{753,
  author = {J. Thomas and N. Weiss and S. Tobias and N. Brummell},
  title = {Magnetic flux pumping and the structure of a sunspot penumbra},
  year = {2002},
  journal = {Astronomische Nachrichten},
  volume = {323},
  pages = {383-386},
  month = {Jan-08-2002},
  issn = {00046337},
  url = {http://doi.wiley.com/10.1002/1521-3994\%28200208\%29323\%3A3/4\%3C383\%3A\%3AAID-ASNA383\%3E3.0.CO\%3B2-M},
  doi = {10.1002/1521-3994(200208)323:3/4<383::AID-ASNA383>3.0.CO;2-M},
}