TY  - CPAPER
AU  - S. Todorova
AU  - T. Hobiger
AU  - H. Schuh
TI  - COMBINATION OF GPS AND SATELLITE ALTIMETRY DATA FOR GLOBAL IONOSPHERE MAPS
T2  - 6th International Scientific Conference - SGEM
PY  - 2006
SP  - 265
EP  - 278
PB  - SGEM Scientific GeoConference
ER  -