1. Topside ionospheric trough morphology: occurrence frequency and diurnal, seasonal, and altitude variations;Ahmed;J. Geophys. Res.,1979
2. Empirical formula for the main ionospheric trough position during magnetic storm;Annakuliev;Geomagn. Aeron.,1993
3. Longitudinal effect in main ionospheric trough configuration. I. The trough position;Deminov;Geomagn. Aeron.,1986
4. Dynamics of midlatitude ionospheric trough during storms. 1. A qualitative pattern;Deminov;Geomagn. Aeron.,1995
5. Dynamics of a midlatitude ionospheric trough during storms: a main phase;Deminov;Geomagn. Aeron.,1995