@misc{BeckFitzenberger2005,
  author    = {Martin Beck and Bernd Fitzenberger},
  title     = {Changes in union membership over time : a panel analysis for West Germany},
  booktitle = {Zentrum f{\"u}r Europ{\"a}ische Wirtschaftsforschung: Discussion paper ; No. [20]03,42 : Labour economics, human resources and social policy},
  volume    = {Mannheim},
  institution = {Wirtschaftswissenschaften},
  type      = {workingpaper},
  pages     = {35},
  year        = {2005},
}