Obradović, Marijana, Sreten Jevremović, Ana Trpković, and Miloš Milosavljević. “Traffic-Spatial Analysis of Road-Rail Crossings on State Roads in the Republic of Serbia”. Put i saobraćaj 66, no. 4 (December 10, 2020): 35-40. Accessed January 19, 2021. http://putisaobracaj.rs/index.php/PiS/article/view/160.