Propagation of trust and distrust

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\begin{bibtex} @inproceedings{DBLP:conf/www/GuhaKRT04, title={Propagation of trust and distrust}, pages={403-412}, year={2004}, crossref={DBLP:conf/www/2004}, booktitle={WWW}, ee={http://doi.acm.org/10.1145/988672.988727}, url={http://www.informatik.uni-trier.de/~ley/db/conf/www/www2004.html#GuhaKRT04}, author={Ramanathan V. Guha and Ravi Kumar and Prabhakar Raghavan and Andrew Tomkins} }\end{bibtex}