Zhelezniak, H. S., and K. I. Soldatov. “RESEARCHING FORMS OF NATURAL OSCILLATIONS OF THE SCHEME ON THE FREQUENCY OF BRIDGE SPAN STRUCTURES”. Science and Transport Progress , no. 33 (August 25, 2010): 80–87. Accessed May 2, 2024. https://stp.ust.edu.ua/article/view/13160.