@inproceedings{CIKM-2002-Al-KhalifaJ,
	author        = "Shurug Al-Khalifa and H. V. Jagadish",
	booktitle     = "{Proceedings of the 11th ACM International Conference on Information and Knowledge Management}",
	doi           = "10.1145/584792.584817",
	pages         = "134--141",
	publisher     = "{ACM}",
	title         = "{Multi-level operator combination in XML query processing}",
	year          = 2002,
}