Flexible Query Answering Systems Third International Conference, FQAS'98, Roskilde, Denmark, May 13-15, 1998, Proceedings - Andreasen, Troels; Andreasen, Troels; Christiansen, Henning; Christiansen, Henning; Larsen, Henrik L.; Larsen, Henrik L. (Springer Berlin Heidelberg : Imprint: Springer, 1998)