@INPROCEEDINGS{Huebsch_07,
author={R. Huebsch and M. Garofalakis and J. Hellerstein and I. Stoica},
title={Sharing Aggregate Computation for Distributed Queries},
booktitle={Proceedings of the 2007 ACM SIGMOD International Conference on Management of Data},
year={2007},
pages={509-520},
address={New York, NY},
url={http://portal.acm.org/citation.cfm?id=1247480.1247535},
}