@InProceedings{GroDor04:ea,
  author    =  {R.~Gro{\ss} and M.~Dorigo},
  title     =  {Evolving a Cooperative Transport Behavior for Two Simple Robots},
  booktitle =  {Artificial Evolution -- 6th International Conference, Evolution Artificielle (EA 2003)},
  editor    =  {P.~Liardet and P.~Collet and C.~Fonlupt and E.~Lutton and M.~Schoenauer},
  year      =  2004,
  pages     =  {305-317},
  volume    =  2936,
  series    =  {Lecture Notes in Computer Science},
  publisher =  {Springer Verlag, Berlin, Germany}
}