• Comparison of 2- and 3-level Half-Bridge DC/DC converters for high-voltage high-power applicationsVinnikov, Dmitri; Strzelecki, RyszardPrzeglad elektrotechniczny = Electrical review2009 / 10, p. 217-221 https://www.researchgate.net/publication/283654804_Comparison_of_2-and_3-level_half-bridge_DCDC_converters_for_high-voltage_high-power_applications