@book{Jansen1996,
  author    = {Jansen, Wolfgang},
  title     = {A note on the determination of the type of communication areas},
  series = {Preprint NLD},
  volume    = {33},
  journal   = {Preprint NLD},
  publisher = {Univ.},
  address   = {Potsdam},
  pages     = {32 S.},
  year      = {1996},
  language  = {en}
}
@book{Jansen1995,
  author    = {Jansen, Wolfgang},
  title     = {CANDYS/QA : algorithms, programs and user's manual},
  series = {Preprint NLD},
  volume    = {27},
  journal   = {Preprint NLD},
  publisher = {Univ.},
  address   = {Potsdam},
  pages     = {140 S.},
  year      = {1995},
  language  = {en}
}