1. The models of day-time low ionosphere for the VLF forecast;Azarnin;Geomagnetizm i Aeronomiya,1976
2. Modeling of the electron density profile of the lower ionosphere (45 – 75 km) for sudden ionospheric disturbance conditions based on the data on sudden phase anomalies of VLF signals;Belenkiy;Int. J. Geomagn. Aeron.,2006
3. Propagation of VLF Radio Waves at High Latitudes;Beloglazov,1982
4. An effective model of low ionosphere for VLF waves at the time of an auroral disturbance;Beloglazov;Geomagnetizm i Aeronomiya,1982
5. Terrestrial Radio Wave Propagation;Bremmer,1949