@InProceedings{reprobjs,
  author = 	 {S. Nestorov and J. Ullman and J. Wiener and S. Chawathe},
  title = 	 {Representative Objects: Concise Representations of
                  Semistructured, Hierarchical Data }, 
  booktitle = 	 {Proceedings of the International Conference on Data
                  Engineering},
  year =	 1997,
  pages =        {79--90},
  address =      {Birmingham, U.K.}
}