Advances in Databases and Information Systems 22nd European Conference, ADBIS 2018, Budapest, Hungary, September 2-5, 2018, Proceedings - Benczúr, András; Benczúr, András; Thalheim, Bernhard; Thalheim, Bernhard; Horváth, Tomáš; Horváth, Tomáš (Springer International Publishing : Imprint: Springer, 2018)