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2. The diurnal variation of the total ionospheric electron content over central Italy;Checcacci;J. Atmos. Terr. Phys.,1966
3. Galdón , E. Daily and seasonal variation of the total electron content of the ionosphere over Tortosa Addendum 84 107 Oslo, Norway 1968
4. Galdón , E. Variation of the total electron content and slab-thickness over Tortosa from November 1964 to March 1968 Tortosa, Spain 1968
5. Total electron content of the ionosphere in middle latitudes;Hibberd;J. Geophys. Res.,1966