Stanisavljević N, Stojanović D, Petrović L. Open Innovation and Crowdsourcing: Challenges and Opportunities for Serbian Railways . Conf Proc E-bus Tech [Internet]. 2022 Jun. 18 [cited 2024 Apr. 19];2(1):36-41. Available from: https://ebt.rs/journals/index.php/conf-proc/article/view/137