@article{DBLP:journals/tods/AhadRM89,
author = {Rafiul Ahad and
K. V. Bapa Rao and
Dennis McLeod},
title = {On Estimating the Cardinality of the Projection of a Database
Relation},
journal = {ACM Trans. Database Syst.},
volume = {14},
number = {1},
year = {1989},
pages = {28-40},
ee = {http://doi.acm.org/10.1145/62032.62034},
bibsource = {DBLP, http://dblp.uni-trier.de}
}
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