@inproceedings{SIGIR-1991-JarvelinN,
	author        = "Kalervo Järvelin and Timo Niemi",
	booktitle     = "{Proceedings of the 14th International ACM SIGIR Conference on Research and Development in Information Retrieval (Special Issue of the SIGIR Forum)}",
	cdrom         = "SIGIR1991/P173.pdf",
	doi           = "10.1145/122860.122877",
	isbn          = "0-89791-448-1",
	pages         = "173--182",
	publisher     = "{ACM}",
	title         = "{Advanced Retrieval From Heterogeneous Fact Databases: Integration of Data Retrieval, Conversion, Aggregation and Deductive Techniques}",
	year          = 1991,
}