ICT Innovations 2019. Big Data Processing and Mining 11th International Conference, ICT Innovations 2019, Ohrid, North Macedonia, October 17-19, 2019, Proceedings - Gievska, Sonja; Gievska, Sonja; Madjarov, Gjorgji; Madjarov, Gjorgji (Springer International Publishing : Imprint: Springer, 2019)