1. Bilitza, D., International Reference Ionosphere 1990, NSSD-C/WDC-A-R&S 90–22, Greenbelt, Maryland: National Space Science Data Center, 1990.
2. Danilov, A.D., Seasonal and diurnal variations in foF2 trends, J. Geophys. Res.: Space Phys., 2015, vol. 120, pp. 3868–3882. https://doi.org/10.1002/2014JA020971
3. Danilov, A.D., Global change in parameters of the upper atmosphere and ionosphere of the Earth, in Sistemnyi monitoring ionosfery (System Monitoring of the Earth), Kotonaeva, N.G., Ed., Moscow: Fizmatlit, 2019, pp. 354–416.
4. Danilov, A.D., Behavior of F2-layer parameters and solar activity indices in the 24th cycle, Adv. Space Res., 2021, vol. 67, pp. 102–110.
5. Danilov, A.D. and Konstantinova, A.V., Long-term variations in the parameters of the middle and upper atmosphere and ionosphere (review), Geomagn. Aeron. (Eng-l. Transl.), 2020a, vol. 60, no. 4, pp. 397–420.