@article{simmons03grace,
  author =      {R. Simmons and et. al.},
  title =       {GRACE: An Autonomous Robot for the AAAI Robot Challenge},
  journal =     {AAAI Magazine},
  volume =      {24},
  number =      {2},
  pages =       {51--72},
  year =        2003,
  month =       {Summer}
}