Aidan Kehoe Flaithrí Neff Ian J. Pitt Gavin Russell Improvements to a speech-enabled user assistance system based on pilot study results. 42-47 2007 SIGDOC http://doi.acm.org/10.1145/1297144.1297153 conf/sigdoc/2007 db/conf/sigdoc/sigdoc2007.html#KehoeNPR07