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1دورية أكاديمية
المؤلفون: Trekell, H. F., Mendelsohn, L. I., Wright, J. H.
المصدر: Transactions of the American Institute of Electrical Engineers Trans. Am. Inst. Electr. Eng. American Institute of Electrical Engineers, Transactions of the. 67(2):1180-1185 Jan, 1948