Bajer, Czesław, and Piotr Tokaj. “Dynamics of the Track With Steel Wedge-Shaped Sleepers”. Roads and Bridges - Drogi i Mosty 5, no. 2 (April 1, 2006): 5–35. Accessed February 9, 2025. https://www.rabdim.pl/index.php/rb/article/view/v5n2p5.