1. Quasi-five- and ten-day oscillations in foF2 and their possible connection with oscillations at lower ionospheric heights;Altadill;Annali Di Geofisicae,1996
2. First observation of quasi-2-day oscillations in ionospheric plasma frequency at fixed heights;Altadill;Annali Di Geophysicae.,1998
3. Origin and development of vertical propagating oscillations with periods of planetary waves in the ionospheric F-region;Altadill;Physics and Chemistry of Earth (C),2001
4. Day-to-day variations in ionosphere TEC as given by satellite data registration;Burlakova;Geomagnetizm and aeronomy,1992