Computer Information Systems and Industrial Management : 18th International Conference, CISIM 2019, Belgrade, Serbia, September 19–21, 2019, Proceedings - Saeed, Khalid (Herausgeber); Chaki, Rituparna (Herausgeber); Janev, Valentina (Herausgeber) (Information Systems and Applications, incl. Internet/Web, and HCI, 2019)