TY  - RPRT
TI  - Gravity model improvement investigation
AU  - Siry, J. W.
AU  - Kahn, W. D.
AU  - Bryan, J. W.
AU  - Vonbun, F. F.
PY  - 1973
UR  - https://ntrs.nasa.gov/citations/19740006950
ID  - 19740006950
ER  -