Department of Computer Science, FEECS VSB-Technical University of Ostrava, Ostrava, Czech Republic.|IT4Innovations, VSB-Technical University of Ostrava, Ostrava, Czech Republic.|IT4Innovations, VSB-Technical University of Ostrava, Ostrava, Czech Republic.|Department of Computer Science, FEECS VSB-Technical University of Ostrava, Ostrava, Czech Republic.|Department of Computer Science, FEECS VSB-Technical University of Ostrava, Ostrava, Czech Republic.|IT4Innovations, VSB-Technical University of Ostrava, Ostrava, Czech Republic.|IT4Innovations, VSB-Technical University of Ostrava, Ostrava, Czech Republic.