@article{Appel2009,
  author    = {Appel, Clemens},
  title     = {Demografischer Wandel},
  series = {KWI Schriften},
  journal   = {KWI Schriften},
  number    = {2},
  issn      = {1867-951X},
  url       = {http://nbn-resolving.de/urn:nbn:de:kobv:517-opus-51883},
  pages     = {45 -- 51},
  year      = {2009},
  language  = {de}
}