@inproceedings{HaEsMu09,
  author={J.-B. Hayet and C. Esteves and R. Murrieta-Cid},
  title={A Motion Planner for Maintaining Landmark Visibility with a 
  Differential Drive Robot},
  booktitle={Proc. WAFR 2008 to be published in Springer Tracts in Advanced Robotics},
  pages={},
  volume=,
  year={2009}}