Michael Benedikt, Leonid Libkin. Exact and Approximate Aggregation in Constraint Query. In Proceedings of the Eighteenth ACM SIGACT-SIGMOD-SIGART Symposium on Principles of Database Systems, May 31 - June 2, 1999, Philadelphia, Pennsylvania. pages 102-113, ACM Press, 1999. [doi]
@inproceedings{BenediktL99, title = {Exact and Approximate Aggregation in Constraint Query}, author = {Michael Benedikt and Leonid Libkin}, year = {1999}, doi = {10.1145/303976.303987}, url = {http://doi.acm.org/10.1145/303976.303987}, tags = {constraints}, researchr = {https://researchr.org/publication/BenediktL99}, cites = {0}, citedby = {0}, pages = {102-113}, booktitle = {Proceedings of the Eighteenth ACM SIGACT-SIGMOD-SIGART Symposium on Principles of Database Systems, May 31 - June 2, 1999, Philadelphia, Pennsylvania}, publisher = {ACM Press}, isbn = {1-58113-062-7}, }