@article{Heller2009,
  author    = {Heller, Wilfried},
  title     = {Problemaufriss der Thematik und {\"U}berblick {\"u}ber die Beitr{\"a}ge dieses Bandes},
  series = {Potsdamer geographische Forschungen},
  journal   = {Potsdamer geographische Forschungen},
  number    = {28},
  issn      = {0940-9688},
  url       = {http://nbn-resolving.de/urn:nbn:de:kobv:517-opus-38760},
  pages     = {9 -- 20},
  year      = {2009},
  language  = {de}
}