@InProceedings{zhang2002a,
  Title                    = {Efficient Aggregation over Objects with Extent},
  Author                   = {D. Zhang and V. J. Tsotras and D. Gunopulos},
  Booktitle                = {Proc. of 21th ACM International SIGACT-SIGMOD-SIGART Symposium on Principles of Database Systems (PODS), Madison, Wisconsin, USA},
  Year                     = {2002},
  Month                    = {June},
  Pages                    = {121-132}
}

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