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2. 2Thomson, W. T., Introduction to Space Dynamics, Wiley, New York, 1963, pp.230-236.
3. General motion of a variable-mass flexible rocket with internal flow
4. Equations of Motion of Two-Phase Variable Mass Systems With Solid Base
5. 5Mao, T.C. “Attitude Motions of Space-Based Variable Mass Systems,” Ph.D. Thesis, Mechanical Engineering Dept.Univ. of Californiaat Davis, Davis, CA,Sept. 1996.