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4. (6) K. Fukuoka, M. Hashimoto, S. Akamatsu, and Y. Oikawa : “Evaluation of magnetic flux density distribution in rotating field type magnetic-particle testing using three-phase AC”, J. Jpn. Soc. Non-Destructive Inspection, Vol. 58, No. 3, pp. 102-107 (2009-3) (in Japanese)
5. (7) K. Fukuoka, I. Kawagoe, T. Ozaki, M. Iwata, M. Kumeta, and Y. Oikawa : “Development of magnetic-particle testing magnetizer for generation of uniform rotating magnetic field in wide area”, J. Jpn. Soc. Appl. Electromagn., Vol. 23, No. 1, pp. 118-124 (2015-3) (in Japanese)