- Alfredo Cuzzocrea, Sergio Greco, Henrik Legind Larsen, Domenico Saccà, Troels Andreasen, Henning Christiansen 0001, editors, Flexible Query Answering Systems - 13th International Conference, FQAS 2019, Amantea, Italy, July 2-5, 2019, Proceedings. Volume 11529 of Lecture Notes in Computer Science, Springer, 2019.