Dario Teixeira Wim F. J. Verhaegh Optimising Attribute Selection in Conversational Search. 138-145 http://springerlink.metapress.com/openurl.asp?genre=article&issn=0302-9743&volume=2807&spage=138 2003 conf/tsd/2003 TSD db/conf/tsd/tsd2003.html#TeixeiraV03