Kostrytsia, S. A., and B. M. Tovt. “The Strain-Stress State Investigation of Structural Units of the Ballast Prism by Type SP3-5/UA”. Science and Transport Progress , no. 38 (September 25, 2011): 17–23. Accessed November 29, 2024. https://stp.ust.edu.ua/article/view/6800.