1. DeBra, D.B., “The large attitude motions and stability, due to gravity of a satellite with passive damping in an orbit of arbitrary eccentricity about an oblate body,” Ph.D. Dissertation Submitted to Stanford University (May 1962).
2. “Satellite stability and natural frequencies in a circular orbit,”;Debra;The Astronaut Sci.,1962
3. Burt, E.G.C., “On the attitude control of earth satellites,” Great Britain RAE Space-TN-3, January 1962 (paper read at the Eighth Anglo-American Aeronautical Conference in London, September 1961).
4. Doolin, B.F., “The application of matrix methods to coordinate transformations occurring in systems studies involving large motions of aircraft,” NACA TN 3968 (May 1957).
5. “Influence of constant disturbing torques on the motion of gravity-gradient stabilized satellites,”;Garber;AIAA Journal,1963