1. Alken, P., Thébault, E., Beggan, C.D., et al., International geomagnetic reference field: The thirteenth generation, Earth Planets Space, 2021, vol. 73, id 49. https://doi.org/10.1186/s40623-020-01288-x
2. Annakuliev, S.K., Afonin, V.V., Deminov, M.G., and Karpachev, A.T., An empirical formula for the position of the main ionospheric trough during a magnetic storm, Geomagn. Aeron. (Engl. Transl.), 1997, vol. 37, no. 3, pp. 392–395.
3. Badin, V.I., Deminov, M.G., Deminov, R.G., and Shubin, V.N., E-layer critical frequency median model for auroral region, Soln.-Zemnaya Fiz., 2013, no. 22, pp. 24–26.
4. Bilitza, D., International Reference Ionosphere 2000, Radio Sci., 2001, vol. 36, pp. 261–275.
5. Bilitza, D., IRI the international standard for the ionosphere, Adv. Radio Sci., 2018, vol. 16, pp. 1–11.