TY  - JOUR
A1  - Bremer, J.
T1  - Investigations of long-term trends in the ionosphere with world-wide ionosonde observations*
JO  - Adv. Radio Sci.
J1  - ARS
VL  - 2
SP  - 253
EP  - 258
Y1  - 2005/05/27
PB  - Copernicus Publications
SN  - 1684-9965
UR  - http://www.adv-radio-sci.net/2/253/2004/
L1  - http://www.adv-radio-sci.net/2/253/2004/ars-2-253-2004.pdf
ER  -