@inproceedings{SIGIR-1987-Kwok,
	author        = "K. L. Kwok",
	booktitle     = "{Proceedings of the 10th International ACM SIGIR Conference on Research and Development in Information Retrieval}",
	cdrom         = "SIGIR1987/P019.pdf",
	doi           = "10.1145/42005.42008",
	isbn          = "0-89791-232-2",
	pages         = "19--23",
	publisher     = "{ACM}",
	title         = "{Some Considerations for Approximate Optimal Queries}",
	year          = 1987,
}