Donghui Zhang, Vassilis J. Tsotras, Dimitrios Gunopulos. Efficient Aggregation over Objects with Extent. In Lucian Popa, editor, Proceedings of the Twenty-first ACM SIGACT-SIGMOD-SIGART Symposium on Principles of Database Systems, June 3-5, Madison, Wisconsin, USA. pages 121-132, ACM, 2002. [doi]
Abstract is missing.