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2. The international Reference Ionosphere 1990;Bilitza,1990
3. Vertical electron density profiles from Digisonde ionograms. The Average Representative Profile;Huang;Annali di Geofisica,1996
4. Seasonal behavior of B0 and B1;Mosert de Gonzales,1997
5. Low latitude Digisonde measurements and comparison with IRI;Reinisch;Adv. Space Res.,1996