1. Rozenfel’d, V.E., Shevchenko, V.V., and Maiboga, V.A., Application of Direct Current of High Voltage for Electric Traction, Zheleznodorozhnyi transport, 1962, no. 7.
2. Rozenfel’d, V.E., Shevchenko, V.V., Maiboga, V.A., and Dolaberidze, G.P., System of Electric Traction of Direct Current of High Voltage with Thyristor Converters for the Stock, Elektricheskaya i teplovoznaya tyaga, 1968, no. 3, pp. 4–6.
3. Fridman, N.A. and Demchenko, N.N., Direct Current of 6 kV in Trolley Line, Zheleznodorozhnyi transport, 1976, no. 1, pp. 87–90.
4. Hugo, N., Stefanutti, P., and Peller, M., Power Electronics Traction Transformer, Proc. EPE07, Aalborg, 2007.
5. Steiner, M. and Reinold, H., Medium Frequency Topology in Railway Application, Proc. EPE07, Aalborg, 2007.