@incollection{Spur2007,
  author    = {G{\"u}nter Spur},
  title     = {Evolution der industriellen Produktion},
  url       = {http://edoc.bbaw.de/oa/series/reXaIF2DOtIqw/PDF/20mD5eCLI1Ih2_332.pdf},
  year      = {2007},
}