Bednarek, Wołodzimierz, and Alfredas Laurinavičius. “Contact Loss Between Railway Track and Subgrade in Vertical Plane During Roadbed Research”. Journal of Civil Engineering and Management 9, no. 1 (March 31, 2003): 10-15. Accessed November 23, 2024. https://jau.vgtu.lt/index.php/JCEM/article/view/9008.