@inproceedings{CheKelKum08,
  author       = {P. Cheng and J. Keller and V. Kumar},
  title        = {Time-Optimal UAV Trajectory Planning for 3D Urban Structure Coverage},
  booktitle    = {Proceedings IEEE/RSJ International Conference on Intelligent Robots and Systems},
  note         = {submitted},
  year         = {2008}
}