Scott B. Huffman April Rasala Lehman Alexei P. Stolboushkin Howard Wong-Toi Fan Yang Hein Röhrig Multiple-signal duplicate detection for search evaluation. 223-230 2007 conf/sigir/2007 SIGIR http://doi.acm.org/10.1145/1277741.1277782 db/conf/sigir/sigir2007.html#HuffmanLSWYR07