@article{BittnerStell2002-vague,
  author	= {Bittner, Thomas and Stell, John G.},
  URL		= {http://people.ifomis.uni-leipzig.de/thomas.bittner/BittnerStellGEIN101-99.pdf},
  pdf		= {http://people.ifomis.uni-leipzig.de/thomas.bittner/BittnerStellGEIN101-99.pdf},
  title		= {Vagueness and Rough Location},
  journal	= {Geoinformatica},
  volume	= {6},
  year		= {2002},
  pages		= {99--121}
}