@TechReport{nouyan-TR2004-18,
  author = {S.~Nouyan and M.~Dorigo},
  title = {Chain Formation in a Swarm of Robots},
  institution = {IRIDIA, Universit\'e Libre de Bruxelles},
  year = 2004,
  number = {TR/IRIDIA/2004-18},
  month = {March}
}