1. Akchyurin, A.D., Minullin, R.G., Nazarenko, V.I., et al., The ionospheric complex “Cyclon”, in Ionosonde Networks and Stations: Proceedings of Session G6 at the XXIV General Assembly of the International Union of Radio Science (URSI), Kyoto, Japan: National Geophysical Data Center, 1995, pp. 35–36.
2. Galkin, I.A., Software for the system of automatic processing of vertical sounding ionograms. I. Interpretation of the height–frequency characteristic, Preprint 22-88, Irkutsk: Siberian Institute of Terrestrial Magnetism and Radiowave Propagation, Siberian Division of the USSR Academy of Sciences, 1988.
3. Givishvili, G.V. and Leshchenko, L.N, Anomalous reflections from the ionosphere, Geomagn. Aeron. (Engl. Transl.), 2013, vol. 53, no. 5, pp. 635–641.
4. Jiang, C., Zhang, Y., Yang, G., et al., Automatic scaling of the sporadic E layer and removal of its multiple reflection and backscatter echoes for vertical incidence ionograms, J. Atmos. Sol.-Terr. Phys., 2015, vol. 129, pp. 41–48.
5. Nozaki, K., Nagayama, M., and Kato, H, Automatic Ionogram Processing System. 1. Data reduction and transmission of ionogram, J. Commun. Res. Lab., 1992, vol. 39, no. 2, pp. 357–365.