Bojović, Nebojša, Miloš Milenković, Marko Kapetanović, and Nikola Knežević. 2016. “Innovations Impact on Efficiency of European Railway Companies”. Management:Journal of Sustainable Business and Management Solutions in Emerging Economies 21 (79):13-25. https://management.fon.bg.ac.rs/index.php/mng/article/view/35.