1. GÓMEX, G., JORBA, A., MASDEMONT, J., and SIMÓ, C. “Final Report: Study Refinement of Semi-Analytical Halo Orbit Theory,” ESOC Contract Report, Contract No. 8625/89/D/MD(SC), Barcelona, Spain, April 1991.
2. GÓMEZ, G., JORBA, A., MASDEMONT, J., and SIMÓ, C. “Study of the Transfer from the Earth to a Halo Orbit Around the Equilibrium Point L1,” Celestial Mechanics and Dynamical Astronomy, Vol. 56, No. 4, 1993, pp. 541–562.
3. GÓMEZ, G., JORBA, A., MASDEMONT, J., and SIMÓ, C. “Moon’s Influence on the Transfer from the Earth to a Halo Orbit Around L1,” Predictability, Stability, and Chaos in N-Body Dynamical Systems (A.E. Roy, editor), Plenum Press, New York, 1991, pp. 283–290.
4. HOWELL, K. C., MAINS, D. L., and BARDEN, B. T. “Transfer Trajectories from Earth Parking Orbits to Sun-Earth Halo Orbits,” Paper No. 94–160, AAS/AIAA Flight Mechanics Conference, Cocoa Beach, Florida, February 1994.
5. BARDEN, B. T. “Using Stable Manifolds to Generate Transfers in the Circular Restricted Problem of Three Bodies,” M. S. Thesis, School of Aeronautics and Astronautics, Purdue University, West Lafayette, Indiana, December 1994.