Silvia Quarteroni Alessandro Moschitti Suresh Manandhar Roberto Basili Advanced Structural Representations for Question Classification and Answer Re-ranking. 234-245 2007 conf/ecir/2007 ECIR http://dx.doi.org/10.1007/978-3-540-71496-5_23 db/conf/ecir/ecir2007.html#QuarteroniMMB07