1. Sources of information concerning the ionosphere;Rawer;Publ. Observ. Ebro. Mem.,1983
2. International Reference Ionosphere - IRI 79,1981
3. World-wide daily variability in the height of the maximum electron density of the ionospheric F2 layer;Shimazaki;J. Radio Res. Labs.,1955
4. An improved model of the variation of electron concentration with height in the ionosphere;Dudeney;J. Atmos. Terr. Phys.,1978
5. A global model for the height of the F2-peak using M3000 values from CCIR numerical map;Bilitza;Telecommunication J.,1979