@misc{Wagner2007,
  author    = {Joachim Wagner},
  title     = {Exports and productivity in Germany},
  institution = {Fr{\"u}here Fachbereiche},
  series    = {University of L{\"u}neburg Working paper series in economics},
  number    = {41},
  type      = {researchpaper},
  year        = {2007},
}