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\bibitem{Xu_etal2004} {\textquotedblleft}\textit{The mode-deviation effect of trapped spinor bose gas beyond mean field theory}{\textquotedblright}. Xu Y, Jia D-J, Chen Z, Gao Y, Li F-S, International journal of modern physics: B: condensed matter physics, statistical physics, applied physics \textbf{18}, 1339 (2004).   http://doi.org/10.1142/S0217979204024719

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