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                                 Abstract:In this paper, using the method of power series expansion, all spherical symme-tric exact solutions of the non-linear equation∂2Φ(x)=cΦ3(x) are given. These solu-tions fall into three types: i)Φ(r)=√-1/c 1/r; ii)Φ(r)=a/(r2+A2); iii)Φ(r)=a′/(r2-A2).
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