@article{Barth1997,
  author    = {Barth, Stephan},
  title     = {St{\"a}dtische soziale Netzwerke in der Moderne},
  series = {neue praxis},
  journal   = {neue praxis},
  number    = {6},
  pages     = {519 -- 532},
  year      = {1997},
  language  = {de}
}
@article{Mennemann1997,
  author    = {Mennemann, Hugo},
  title     = {Krieg oder Vertrag der Generationen. {\"A}ltere Menschen und die Zukunft des Sozialstaates},
  series = {Vorg{\"a}nge},
  journal   = {Vorg{\"a}nge},
  number    = {2},
  pages     = {20 -- 29},
  year      = {1997},
  language  = {de}
}