Jeanne Villaneau Jean-Yves Antoine Olivier Ridoux Logical Approach to Natural Language Understanding in a Spoken Dialogue System. 637-644 http://springerlink.metapress.com/openurl.asp?genre=article&issn=0302-9743&volume=3206&spage=637 2004 conf/tsd/2004 TSD db/conf/tsd/tsd2004.html#VillaneauAR04