@InProceedings{ooindexing,
  author = 	 {S. Chawathe and M. Chen and P. Yu},
  title = 	 {On Index Selection Schemes for Nested Object Hierarchies },
  booktitle = 	 {Proceedings of the International Conference on Very
                  Large Data Bases}, 
  year =	 1994,
  address =	 {Santiago, Chile},
  month =	 sep,
  pages =	 {331-341}
}