Author,Title,Journal,ISSN,Publisher,Date,Volume,Number,Page,URL,URL(DOI) Sugimoto Takesi,Constant Voltage DC Feeding System to Save Energy.,IEEJ Transactions on Industry Applications,09136339,The Institute of Electrical Engineers of Japan,1992,112,8,737-746,https://cir.nii.ac.jp/crid/1390001204656151936,https://doi.org/10.1541/ieejias.112.737