Milenković, I., P. Pitka, T. Savković, and A. Vujičić. “Concept of the Regional Integration of Transit System in Rebublic of Serbia”. Journal of Road and Traffic Engineering, Vol. 63, no. 4, May 2019, pp. 55-59, https://putisaobracaj.rs/index.php/PiS/article/view/93.