Bencze, P., D. Buresová, J. Lastovicka, and F. Märcz. 2004. “Behaviour of the F1-Region, and Esand Spread-F Phenomena at European Middle Latitudes, Particularly under Geomagnetic Storm Conditions”. Annals of Geophysics 47 (2-3 Sup.). https://doi.org/10.4401/ag-3290.