@article{SmithVarzi2002,
  author	= {Smith, Barry and Varzi, Achille C.},
  URL		= {http://ontology.buffalo.edu/smith/articles/Surrounding\_space.pdf},
  pdf		= {http://ontology.buffalo.edu/smith/articles/Surrounding\_space.pdf},
  title		= {Surrounding Space: The Ontology of Organism-Environment Relations},
  journal	= {Theory in Biosciences / Theorie in den Biowissenschaften},
  volume	= {121},
  year		= {2002},
  number	= {2},
  pages		= {139--162}
}