@article{OstermannTimpf2009,
  author    = {Frank O. Ostermann and Sabine Timpf},
  title     = {Use and appropriation of space in urban public parks: GIS methods in social geography},
  journal   = {Geographica Helvetica},
  volume    = {64},
  number    = {1},
  pages     = {30 -- 36},
  doi       = {10.5194/gh-64-30-2009},
  year      = {2009},
}