1. Beig, G., 2001. An overview of the mesospheric temperature trend—state of the art and progressing report on assessment (MTTA). Paper Presented at the Workshop “Long-term Changes and Trends in the Atmosphere, Prague, 2–6 July 2001 (Abstracts, p. 2)
2. Long-term changes of hmF2 possible latitudinal and regional variations;Bencze,1998
3. Bremer, J., 1996. Some additional results of long-term trends in vertical-incidence ionosonde data. Paper Presented at the COST 251 Meeting, Prague, September 1996
4. Trends in the ionospheric E and F regions over Europe;Bremer;Ann. Geophys.,1998
5. Trends in the thermosphere derived from global ionosonde observations;Bremer;Adv. Space Res.,2001