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IEEE Transactions on Magnetics > 2009 > 45 > 3 > 1694 - 1699
IEEE Transactions on Magnetics > 2008 > 44 > 10 > 2317 - 2323
Transactions of the American Institute of Electrical Engineers > 1940 > 59 > 11 > 637 - 642
Transactions of the American Institute of Electrical Engineers > 1918 > XXXVII > 1 > 463 - 489