@incollection{Donnelly2003,
  author	= {Donnelly, Maureen},
  URL		= {http://ontology.buffalo.edu/medo/Donnelly\_IJCAI03.pdf},
  pdf		= {http://ontology.buffalo.edu/medo/Donnelly\_IJCAI03.pdf},
  title		= {Layered Mereotopology},
  booktitle	= {IJCAI 2003 -- Eighteenth International Joint Conference on Artificial Intelligence},
  year		= {2003}
}