Artificial Intelligence: Methodology, Systems, and Applications 18th International Conference, AIMSA 2018, Varna, Bulgaria, September 12-14, 2018, Proceedings - Agre, Gennady; Agre, Gennady; van Genabith, Josef; van Genabith, Josef; Declerck, Thierry; Declerck, Thierry (Springer International Publishing : Imprint: Springer, 2018)