@article{DBLP:journals/vldb/Cohen09,
author = {Sara Cohen},
title = {Equivalence of queries that are sensitive to multiplicities},
journal = {VLDB J.},
volume = {18},
number = {3},
year = {2009},
pages = {765-785},
ee = {http://dx.doi.org/10.1007/s00778-008-0122-1},
bibsource = {DBLP, http://dblp.uni-trier.de}
}