Influence of learning styles on improving efficiency of adaptive educational hypermedia systems - Suad Kulaglic; Samra Mujacic; Izudinka Kapetanovic Serdarevic; Suad Kasapovic (2013 12th International Conference on Information Technology Based Higher Education and Training, ITHET 2013, Antalya, Turkey, October 10-12, 2013, 2013)