TY  - RPRT
TI  - Gravity model comparison using GEOS 1 long- arc orbital solutions
AU  - Lerch, F. J.
AU  - Marsh, J. G.
AU  - Oneill, B.
PY  - 1969
UR  - https://ntrs.nasa.gov/citations/19690018034
ID  - 19690018034
ER  -