Stankov, Stanimir M., Jean-Claude Jodogne, Ivan Kutiev, Koen Stegen, and René Warnant. “Evaluation of Automatic Ionogram Scaling for Use in Real-Time Ionospheric Density Profile Specification: Dourbes DGS-256/ARTIST-4 Performance”. Annals of Geophysics 55, no. 2 (June 5, 2012). Accessed May 21, 2022. https://www.annalsofgeophysics.eu/index.php/annals/article/view/4976.