@article{SmithMark2003-mountains,
  author	= {Smith, Barry and Mark, David M.},
  URL		= {http://ontology.buffalo.edu/smith/articles/Mountains.htm},
  urlpage	= {http://ontology.buffalo.edu/smith/articles/Mountains.htm},
  title		= {Do Mountains Exist? Towards an Ontology of Landforms},
  journal	= {Environment and Planning B (Planning and Design)},
  volume	= {30},
  year		= {2003},
  number	= {3},
  pages		= {411--427}
}