Romanko, V. I., O. V. Romanko, and V. M. Stepanenko. “Work Efficiency of the Ukrzaliznytsya Signalization and Connection Sector”. Science and Transport Progress , no. 35 (December 25, 2010): 278–280. Accessed May 3, 2024. https://stp.ust.edu.ua/article/view/8900.