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u [i] J. Slonczewski: J. Magn. Magn. Mater. 159 (1996) L1.
u [ii] L. Berger: Phys. Rev. B 54 (1996) 9353.
u [iii] E. B. Myers, D. C. Ralph, J. A. Katine, R. N. Louie, R. A. Buhrman: Science 285 (2000) 865.
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