1.
Lastovicka J, Mlch P. Solar cycle effect on oscillations in the period range of 2-20 days in the F region of the ionosphere. Ann. Geophys. [Internet]. 1996Nov.25 [cited 2021Dec.2];39(4). Available from: https://www.annalsofgeophysics.eu/index.php/annals/article/view/4018