@article{DBLP:journals/tois/GreiffCT99,
author = {Warren R. Greiff and
W. Bruce Croft and
Howard R. Turtle},
title = {PIC matrices: a computationally tractable class of probabilistic
query operators},
journal = {ACM Trans. Inf. Syst.},
volume = {17},
number = {4},
year = {1999},
pages = {367-405},
ee = {http://doi.acm.org/10.1145/326440.326444},
bibsource = {DBLP, http://dblp.uni-trier.de}
}
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