@article{DachwaldWi2008,
  author    = {Bernd Dachwald and Bong Wi},
  title     = {Solar Sail Kinetic Energy Impactor Trajectory Optimization for an Asteroid-Deflection Mission},
  journal   = {Journal of Spacecraft and Rockets. 44 (2007), H. 4},
  pages     = {755 -- 764},
  year      = {2008},
}