T. Razmov and J. Varadinova, “Economic Assessment of the Level of Safety in the Railway Transport on a Base an Arised Emergency Situations”, НТ, no. 3, pp. 195–206, Jul. 2021, Accessed: Jul. 23, 2026. Available: https://yb.e-dnrs.org/index.php/rp/article/view/5281