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Adriano Veloso Humberto Mossri de Almeida Marcos André Gonçalves Wagner Meira Jr. Learning to rank at query-time using association rules. 267-274 2008 SIGIR http://doi.acm.org/10.1145/1390334.1390381 conf/sigir/2008 db/conf/sigir/sigir2008.html#VelosoAGM08