@misc{AddisonSchnabelWagner2006,
  author    = {John T. Addison and Claus Schnabel and Joachim Wagner},
  title     = {The (Parlous) State of German Unions},
  institution = {Fr{\"u}here Fachbereiche},
  series    = {University of L{\"u}neburg Working paper series in economics},
  number    = {23},
  type      = {researchpaper},
  year        = {2006},
}