Romano, Vincenzo, Silvia Pau, Michael Pezzopane, Luca Spogli, Enrico Zuccheretti, Marcio Aquino, and Craig M. Hancock. “ESWua: A Tool to Manage and Access GNSS Ionospheric Data from Mid-to-High Latitudes”. Annals of Geophysics 56, no. 2 (June 11, 2013): R0223. Accessed October 28, 2021. https://www.annalsofgeophysics.eu/index.php/annals/article/view/6244.