Patrick Bosc Olivier Pivert Grégory Smits A Flexible Querying Approach Based on Outranking and Classification. 1-12 2009 FQAS http://dx.doi.org/10.1007/978-3-642-04957-6_1 conf/fqas/2009 db/conf/fqas/fqas2009.html#BoscPS09