@article{20162,
  author       = {{Hamann, Heiko}},
  journal      = {{Swarm Intelligence}},
  number       = {{3}},
  pages        = {{145--172}},
  title        = {{{Towards Swarm Calculus: Urn Models of Collective Decisions and Universal Properties of Swarm Performance}}},
  doi          = {{10.1007/s11721-013-0080-0}},
  volume       = {{7}},
  year         = {{2013}},
}