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2. Some results of electron content measurements at Tortosa from the Intelsat II-F3 transmissions;Alberca;Sci. Rep.,1974
3. Contribución del observatorio del Ebro al estudio de la ionosfera terrestre (in Spanish);Alberca;Física de la Tierra,2000
4. Some Historical Highlights of the Ebro Observatory;Alberca;Beiträge zur Geschichte der Geophysik und Kosmischen Physik, III, Heft 2,2002
5. Planetary wave type oscillations in the ionospheric F region;Altadill;Adv. Space Res.,2000