@inproceedings{STOC-1977-ChandraM,
	author        = "Ashok K. Chandra and Philip M. Merlin",
	booktitle     = "{Proceedings of the Ninth Annual ACM Symposium on Theory of Computing}",
	doi           = "10.1145/800105.803397",
	pages         = "77--90",
	publisher     = "{ACM}",
	title         = "{Optimal Implementation of Conjunctive Queries in Relational Data Bases}",
	year          = 1977,
}