1. Buck, T.: 1920, ?Oscillating Satellites Near the Lagrangian Equilateral-Triangular Points?, in F. R. Moulton (ed.),Periodic Orbits, Carnegie Institute of Washington, pp. 300?324.
2. Cole, J. D.: 1965,Perturbation Methods in Applied Mathematics, Blaisdell, Waltham, Mass., pp. 79?102.
3. Davis, H. T.: 1962,Introduction to Nonlinear Differential and Integral Equations, Dover, New York.
4. Farquhar, R. W. and Kamel, A. A.: 1972, ?Quasi-Periodic Orbits about the Translunar Libration Point?, AIAA Paper 72-935, AIAA/AAS Astrodynamics Conf., Sept. 1972. (Solutions previously listed in NASA TN D-6365, July 1971.)
5. Goldstein, H.: 1965,Classical Mechanics, Addison-Wesley, Reading, Mass.