Computer Information Systems and Industrial Management 18th International Conference, CISIM 2019, Belgrade, Serbia, September 19-21, 2019, Proceedings - Saeed, Khalid; Saeed, Khalid; Chaki, Rituparna; Chaki, Rituparna; Janev, Valentina; Janev, Valentina (Springer International Publishing : Imprint: Springer, 2019)