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3. Wooden , W. H. Dunham , J. B. Simulations of Autonomous Satellite Navigation with the Global Positioning System AIAA/AAS Astrodynamics Conference Aug. 1978
4. Stein , W. L. GPSPAC Space Navigation Simulation Results ION National Aerospace Conference 136 March 1979
5. Feinberg , P. Heuberger , H. Huff , D. Landsat-IV Global Positioning Subsystem (GPS) Annual Rocky Mountain Guidance and Control Conference Feb. 1983