Contributions of qqqq q components to nucleon spin structure

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. Helminen C, Riska D O. Nucl. Phys. A, 2002, 699: 6242. LI Q B, Riska D O. Phys. Rev. C, 2006, 73: 035201; Nucl.Phys. A, 2005, 766: 172; Phys. Rev. C, 2006, 74: 0152023. Juliá-Díaz, Riska D O. Nucl. Phys. A, 2006, 780: 1754. ZOU B S, Riska D O. Phys. Rev. Lett., 2005, 95: 072001;Riska D O, ZOU B S. Phys. Lett. B, 2006, 36: 2655. AN C S, Riska D O, ZOU B S. Phys. Rev. C, 2006, 73:0352076. AN C S, LI Q B, Riska D O, ZOU B S. Phys. Rev. C, 2006,74: 0552057. Donoghue J F, Golowich E. Phys. Rev. D, 1977, 15: 34218. HE H X, ZHANG X Z, ZHUO Y Z. Chinese Phys., 1984,4: 3599. ZOU B S. Int. J. Mod. Phys. A, 2006, 21: 83510. Particle Data Group. J. Phys. G: Nucl. Part. Phys., 2006,33: 96611. FNAL E866/NuSea Collaboration. Towell R S et al. Phys.Rev. D, 2001, 64: 05200212. HERMES Collaboration. Airaptian A et al. Phys. Rev. D,2007, 75: 01200713. de Florian D, Navarro G A, Sassot R. Phys. Rev. D, 2005,71: 094018