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Toshiaki Yanada and  Kazumi Ishikawa,  Analysis and Performance Evaluation of Noise-Reduction Transformer.   journal   = {International Journal of Electrical, Computer, Energetic, Electronic and Communication Engineering}, [online]. World Academy of Science, Engineering and Technology. May 2012, vol. 65(5). 520 - 524[viewed 16 December 2017]. Available from: http://waset.org/publications/9412.