Decision Support Systems IX: Main Developments and Future Trends 5th International Conference on Decision Support System Technology, EmC-ICDSST 2019, Funchal, Madeira, Portugal, May 27-29, 2019, Proceedings - Freitas, Paulo Sérgio Abreu; Freitas, Paulo Sérgio Abreu; Dargam, Fatima; Dargam, Fatima; Moreno, José Maria; Moreno, José Maria (Springer International Publishing : Imprint: Springer, 2019)