O. M. Bondarev, O. E. Kryvchykov, D. A. Yagoda, V. S. Bondareva, and V. V. Ryadkovskiy, “Theoretical and experimental evaluation of strength indices of bogie frame transoms for trailing cars of electric trains ER9M, ER9E”, STP, no. 6(48), pp. 120–131, Dec. 2013.