@misc{Kauffmann2008,
  author    = {Albrecht Kauffmann},
  title     = {Transport costs and the size of cities},
  institution = {Wirtschaftswissenschaften},
  series    = {Volkswirtschaftliche Diskussionsbeitr{\"a}ge},
  number    = {93},
  type      = {workingpaper},
  year        = {2008},
}