@InProceedings{GroDor04:ants,
  author    = {R.~Gro{\ss} and M.~Dorigo},
  title     = {Cooperative Transport of Objects of Different Shapes and Sizes},
  year      = 2004,
  pages     = {106--117},
  booktitle = {Ant Colony Optimization and Swarm Intelligence, 4th International Workshop, ANTS~2004},
  editor    = {M.~Dorigo and M.~Birattari and C.~Blum and L.~M.~Gambardella and F.~Mondada and T.~St\"{u}tzle},
  volume    = 3172,
  series    = {Lecture Notes in Computer Science},
  publisher = {Springer Verlag, Berlin, Germany}
}