Altadill, D., Apostolov, E. M., Boska, J., Lastovicka, J. and Sauli, P. (2004) “Planetary and gravity wave signatures in the F-region ionosphere with impacton radio propagation predictionsand variability”, Annals of Geophysics, 47(2-3 Sup.). doi: 10.4401/ag-3288.