@inproceedings{BosCurranGuzzetti2007TREC,
   title     = {The Pronto QA system at TREC-2007: harvesting hyponyms, using nominalisation patterns, and computing answer cardinality},
   author    = {Bos, Johan and Curran, James R. and Guzzetti, Edoardo},
   booktitle = {The Sixteenth Text RETrieval Conference, TREC 2007},
   editor    = {Voorhees, E. M. and Buckland, L. P.},
   address   = {Gaitersburg, MD},
   pages     = {726--732},
   year      = {2007}
}