@inproceedings{PODS-2001-BenediktLSS,
	author        = "Michael Benedikt and Leonid Libkin and Thomas Schwentick and Luc Segoufin",
	booktitle     = "{Proceedings of the 20th Symposium on Principles of Database Systems}",
	doi           = "10.1145/375551.375578",
	ee            = "http://www.acm.org/sigs/sigmod/pods/proc01/online/p56.pdf",
	isbn          = "1-58113-361-8",
	publisher     = "{ACM}",
	title         = "{String Operations in Query Languages}",
	year          = 2001,
}