@techreport{Scholl1989compl-23426, title={On the complexity of nested relational operations}, year={1989}, author={Scholl, Marc}, note={Database Query Optimization, Proceedings of the ODBF Workshop Goeh Graefe Technical Report No. CS/E 89-005 May 1989 http://drl.ohsu.edu/cdm/singleitem/collection/csetech/id/273/rec/11} }

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