Error analysis of difficult TREC topics Xiao Hu, Sindhura Bandhakavi, and Chengxiang Zhai Return to Posters BIBTEX @inproceedings       {DBLP:conf/sigir/HuBZ03,   author    = {Xiao Hu and                 Sindhura Bandhakavi and                 Chengxiang Zhai},    booktitle = {SIGIR},    title     = {Error analysis of difficult TREC topics.},    pages     = {407-408},    year      = {2003},    url       = {db/conf/sigir/sigir2003.html#HuBZ03},    ee        = {http://doi.acm.org/10.1145/860524},    crossref  = {conf/sigir/2003},    bibsource = {DBLP, http://dblp.uni-trier.de}  } ©2004 Association for Computing Machinery