1. Cash, W., the New Worlds Team: The new worlds observer: the astrophysics strategic mission concept study. In: EPJ Web of Conferences, vol. 16 (2011), doi: 10.1051/epjconf/20111607004
2. Barden, B.T., Howell, K.C.: Fundamental motions near collinear libration points and their transitions. J. Astronaut. Sci. 46, 361–378 (1998)
3. Howell, K.C., Marchand, B.G.: Natural and non-natural spacecraft formations near the L 1 and L 2 libration points in the Sun-Earth/Moon ephemeris system. Dyn Syst: an International Journal, Special Issue: Dynamical Systems in Dynamical Astronomy and Space Mission Design 20, 149–173 (2005)
4. Gómez, G., Lo, M., Masdemont, J., Museth, K. Simulation of formation flight near L 2 for the TPF mission. In: AAS Astrodynamics Specialist Conference, Quebec City, Canada. Paper No. AAS 01-305 (2001)
5. Marchand, B.G., Howell, K.C.: Control strategies for formation flight in the vicinity of the libration points. J. Guid. Control Dyn. 28, 1210–1219 (2005)