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4. Das, A., S.H. Siegel, and H.L. Stallings (1977). Attitude determination techniques for Nimbus 6 and Nimbus G. Am. Astro. Soc. and AIAA Astro. Specialist Conf., Jackson Hole, Wyo., September 7–9.
5. Hsing, J.C., A. Ramos, and M.F. Barrett (1978). Gyro-based attitude reference systems for communications satellites. Proc. 7th AIAA Comm. Sat. Syst. Conf., San Diego, April 23–27.