@article{Stankov:940,
      author        = "Stankov, S. M. and Stegen, K. and Muhtarov, Plamen and
                       Warnant, R.",
      title         = "{Local ionospheric electron density profile reconstruction
                       in real time from simultaneous ground-based GNSS and
                       ionosonde measurements}",
      year          = "2011",
}