Kaluđerović, Miroslava, Slađana Stanković, Mara Dabović, and Suzana Mazić. “Reorganization and Development of the Trolleybus Subsystem in Belgrade”. Journal of Road and Traffic Engineering 65, no. 4 (December 22, 2019): 45-47. Accessed March 29, 2024. https://putisaobracaj.rs/index.php/PiS/article/view/127.