Databases and Information Systems 13th International Baltic Conference, DB&IS 2018, Trakai, Lithuania, July 1-4, 2018, Proceedings - Lupeikiene, Audrone; Lupeikiene, Audrone; Vasilecas, Olegas; Vasilecas, Olegas; Dzemyda, Gintautas; Dzemyda, Gintautas (Springer International Publishing : Imprint: Springer, 2018)