• High-voltage auxiliary power supply with the simplified power circuit topology for the DC trains [Electronic resource]Vinnikov, Dmitri; Laugis, JuhanProceedings of the 9th International Conference "Electrical Power Quality and Utilisation" : EPQU'2007 : Barcelona, Spain, October 9-11, 20072007 / [6] p. [CD-ROM] https://ieeexplore.ieee.org/document/4424227