@inproceedings{SIGMOD-1990-Sheng,
	author        = "Yeh-Heng Sheng",
	booktitle     = "{Proceedings of the 20th ACM SIGMOD International Conference on Management of Data}",
	cdrom         = "SIGMOD90/P054.PDF",
	doi           = "10.1145/93597.93621",
	pages         = "54--63",
	title         = "{IDLOG: Extending the Expressive Power of Deductive Database Languages}",
	year          = 1990,
}