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IEEE Translation Journal on Magnetics in Japan > 1991 > 6 > 5 > 408 - 414
IEEE Spectrum > 1970 > 7 > 9 > 47 - 58
IEEE Translation Journal on Magnetics in Japan > 1991 > 6 > 5 > 408 - 414
IEEE Spectrum > 1970 > 7 > 9 > 47 - 58