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2000. "Precise Orbit Determination for the GEOSAT Follow-On Spacecraft." Proceedings of the 12th International Workshop on Laser Ranging (ILRS), Nov. 13-17, 2000, Matera, Italy [Full Text] [Proceedings]

2000. "Orbit determination for Mars Global Surveyor during mapping." Proceedings of the AAS/AIAA Astrodynamics Meeting, Aug. 16-19, 1999, Girdwood, Alaska, Advances in the Astronautical Sciences 103 435-451 [Proceedings]

1999. "Precise orbit determination for the GEOSAT Follow-On Spacecraft." Proceedings of the 1999 Flight Mechanics Symposium NASA/CP-1999-209235 495-508 [Full Text] [Proceedings]

1999. "Precise orbit determination of the low altitude spacecraft TRMM, GFZ-1 and EP/EUVE using improved drag models." Proceedings of the AAS/AIAA Spaceflight Mechanics Meeting, Feb. 3–7, 1999, Breckinridge, Colorado 102 1277-1296 [Proceedings]

1999. "Precise orbit determination for Mars Global Surveyor during Hiatus and SPO." AAS/AIAA Spaceflight Mechanics Meeting, Feb. 3–7, 1999, Breckinridge, Colorado, Advances in the Astronautical Sciences 102 649-666 [Proceedings]

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