1. Beletskii, V. V.: 1966,Motion of an Artificial Satellite About Its Center of Mass, translated from Russian as NASA TT F-429.
2. Hitzl, D. L.: 1969,Am. Inst. Aeron. Astron. J. 7, 1039?1047.
3. Hitzl, D. L.: 1970, Gravity-Gradient Attitude Perturbations of Symmetric and Tri-Axial Satellites Near Resonance', Ph.D. Thesis, Stanford University.
4. Kane, T. R., and Barba, P. M.: 1966,Trans. ASME, pp. 402?405.
5. Likins, P. W.: 1965,J. Astron. Sci. XII, 18?24.