@article{Appel2009,
  author    = {Clemens Appel},
  title     = {Demografischer Wandel},
  journal   = {KWI Schriften},
  series    = {Herausforderungen f{\"u}r Politik und Verwaltung},
  number    = {2},
  pages     = {45 -- 51},
  year      = {2009},
}