1. B.T. Barden, K.C. Howell, Formation flying in the vicinity of libration point orbits, AAS 98-169.
2. G. Gómez, M. Marcote, J.J. Masdemont, J.M. Mondelo, Natural configurations and controlled motions suitable for formation flying, AAS 05-347.
3. A. Héritier, K.C. Howell, Regions near the libration points suitable to maintain multiple spacecraft.
4. Formation flying and relative dynamics under the circular restricted three-body problem formulation;Ferrari,2014
5. M. Bando, A. Ichikawa, Periodic orbits and formation flying near the libration points.