@INPROCEEDINGS{DoerrJohannsen2007b,
  AUTHOR       = {Doerr, Benjamin and Johannsen, Daniel},
  TITLE        = {Refined Runtime Analysis of a Basic Ant Colony Optimization Algorithm},
  BOOKTITLE    = {IEEE Congress on Evolutionary Computation 2007},
  PADDRESS     = {Vancouver, CA},
  ADDRESS      = {Singapore},
  PUBLISHER    = {IEEE},
  ISBN         = {1-4244-1339-7},
  YEAR         = {2007},
  PAGES        = {501--507},
}