Inès Kamoun Fourati Mohamed Tmar Abdelmajid Ben Hamadou Structural Relevance Feedback in XML Retrieval. 168-178 2009 FQAS http://dx.doi.org/10.1007/978-3-642-04957-6_15 conf/fqas/2009 db/conf/fqas/fqas2009.html#FouratiTH09