Center for Additive Manufacturing and Logistics - 1981 Steigerwald, R. L., & Hopkins, D. C. (1981). Characteristic Input Harmonics of DC-DC Converters and their Effect on Input Filter Design. IEEE Transactions on Industrial Electronics and Control Instrumentation, IECI-28(2), 73–82. https://doi.org/10.1109/tieci.1981.351029