@inproceedings{SIGIR-1998-KekalainenJ,
	author        = "Jaana Kekäläinen and Kalervo Järvelin",
	booktitle     = "{Proceedings of the 21st International ACM SIGIR Conference on Research and Development in Information Retrieval}",
	cdrom         = "SIGIR1998/P130.pdf",
	doi           = "10.1145/290941.290978",
	pages         = "130--137",
	publisher     = "{ACM}",
	title         = "{The Impact of Query Structure and Query Expansion on Retrieval Performance}",
	year          = 1998,
}