Analytical study of magnetization dynamics driven by spin-polarized currentsR. Bonin, C. Serpico, G. Bertotti, I. D. Mayergoyz and M. d'AquinoEur. Phys. J. B, 59 4 (2007) 435-445DOI: https://doi.org/10.1140/epjb/e2007-00051-5