Bencze, P., Buresová, D., Lastovicka, J. and Märcz, F. 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. (Dec. 2004). DOI:https://doi.org/10.4401/ag-3290.