1. Total electron content at low latitude and its comparison with the IRI90;Batista;Adv. Space Res.,1994
2. Ionospheric investigations using digital Alouette/ISIS topside sounder ionograms;Benson,1997
3. A highly successful empirical model for the worldwide ionospheric electron density profile;Bent,1972
4. Description and Evaluation of the Bent Ionospheric Model;Bent;Air Force Space Missile Systems Organization, USAF Report SAMSO TR-72-239,1972
5. Electron density in the equatorial topside;Bilitza;Adv. Space Res.,1985