1. A global model for the height of the F2-peak using M3000 values from the CCIR numerical map;Bilitza;Telecomm. J.,1979
2. A phenomenological model of global ionospheric electron density in the E-, F1-and F2 regions;Ching;J. Atmos. Terr. Phys.,1973
3. An improved phenomenological model of the ionospheric density;Chiu;J. Atmos. Terr. Phys.,1975
4. Description of the 1965–1971 ionospheric model used in the definitive orbit determination system (DODS);Bent;Report DBA Systems,1970
5. A simple empirical method for estimating the height and semi-thickness of the F2-layer at the Argentine Islands Graham Land;Dudeney;Science Report No. 88,1975