@inproceedings {4790,
	title = {Query Optimization for Structured Documents Based on Knowledge On The Document Type Definition},
	booktitle = {Advances in Digital Libraries (ADL)},
	year = {1998},
	doi = {10.1109/ADL.1998.670397},
	author = {Klemens B{\"o}hm and Karl Aberer and Tamer Ozsu and Kathrin Gayer}
}
