Flexible Query Answering Systems 6th International Conference, FQAS 2004, Lyon, France, June 24-26, 2004, Proceedings - Christiansen, Henning; Christiansen, Henning; Hacid, Mohand-Said; Hacid, Mohand-Said; Andreasen, Troels; Andreasen, Troels; Larsen, Henrik Legind; Larsen, Henrik Legind (Springer Berlin Heidelberg : Imprint: Springer, 2004)