@article{Dachwald2008,
  author    = {Bernd Dachwald},
  title     = {Optimal Solar Sail Trajectories for Missions to the Outer Solar System},
  journal   = {Journal of guidance, control, and dynamics. 28 (2005), H. 6},
  pages     = {1187 -- 1193},
  year      = {2008},
}