Anne-Laure Ligozat Brigitte Grau Anne Vilnat Isabelle Robba Arnaud Grappy Lexical validation of answers in Question Answering. 330-333 2007 conf/webi/2007 Web Intelligence http://dx.doi.org/10.1109/WI.2007.70 db/conf/webi/webi2007.html#LigozatGVRG07