@InProceedings{cmtoolkit,
  author = 	 {S. Chawathe and H. Garcia-Molina and J. Widom},
  title = 	 {A toolkit for constraint management in heterogeneous
                  information systems},
  booktitle = 	 {Proceedings of the International Conference on Data
                  Engineering}, 
  address =      {New Orleans, Louisiana},
  pages =        {56-65},
  year =	 1996,
  month =        feb
}