TY  - RPRT
TI  - Subsatellite Orbital Analysis Program (SOAP) user's guide
AU  - Castle, K. G.
AU  - Voss, J. M.
AU  - Gibson, J. S.
PY  - 1981
UR  - https://ntrs.nasa.gov/citations/19810024677
ID  - 19810024677
ER  -