TY  - RPRT
TI  - Ionosphere explorer i satellite - first observations from the fixed-frequency topside sounder.
AU  - Calvert, W.
AU  - Knecht, R. W.
AU  - Van Zandt, T. E.
PY  - 1964
UR  - https://ntrs.nasa.gov/citations/19640040992
ID  - 19640040992
ER  -