TY  - RPRT
TI  - Estimating Baselines From Constrained Data On GPS Orbits
AU  - Lindqwister, Ulf J.
AU  - Lichten, Stephen M.
AU  - Blewitt, Geoffrey I.
PY  - 1991
UR  - https://ntrs.nasa.gov/citations/19910000576
ID  - 19910000576
ER  -