Orošnjak, Marko, Mitar Jocanović, Branka Gvozdenac-Urošević, Dragoljub Šević, Ljubica Duđak, and Velibor Karanović. “Bus Fleet Management – A Systematic Literature Review”. Promet - Traffic&Transportation 32, no. 6 (November 10, 2020): 761–772. Accessed August 26, 2025. https://traffic2.fpz.hr/index.php/PROMTT/article/view/2898.