@InProceedings{repr-objs,
  author =	 {Svetlozar Nestorov and Jeffrey D. Ullman and Janet
                  Wiener and Sudarshan S. Chawathe},
  title =	 {Representative Objects: Concise Representations of
                  Semistructured, Hierarchial Data},
  booktitle =    ICDE,
  year =	 1997,
  address =	 {Birmingham, U.K.},
  pages =	 {79-90}
}