@InProceedings{tdiff,
  author = 	 "S. S. Chawathe and A. Rajaraman and H. Garcia-Molina
		  and J. Widom",
  title = 	 "Change Detection in Hierarchically Structured Information",
  pages =	 "493--504",
  booktitle =	 "Proceedings of the ACM SIGMOD International
		  Conference on Management of Data",
  year =	 1996,
  address =	 "Montr\'eal, Qu\'ebec",
  month =	 "June"
}