@inproceedings{SIGMOD-1989-Colby,
	author        = "Latha S. Colby",
	booktitle     = "{Proceedings of the 19th ACM SIGMOD International Conference on Management of Data}",
	cdrom         = "SIGMOD89/P273.PDF",
	doi           = "10.1145/67544.66952",
	pages         = "273--283",
	title         = "{A Recursive Algebra and Query Optimization for Nested Relations}",
	year          = 1989,
}