Stankov, Stanimir M., Jean-Claude Jodogne, Ivan Kutiev, Koen Stegen, and René Warnant. 2012. “Evaluation of Automatic Ionogram Scaling for Use in Real-Time Ionospheric Density Profile Specification: Dourbes DGS-256/ARTIST-4 Performance”. Annals of Geophysics 55 (2). https://doi.org/10.4401/ag-4976.