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First, under the assumption that $(M,h)$ is the euclidean 3-space endowed with a semi-perturbed metric with perturbation small in $C^1$ norm and of compact support, we prove that if there is some point $\\bar{x} \\in M$ with scalar curvature $R^M(\\bar{x})>0$ then there exists a smooth embedding $f:S^2 \\hookrightarrow M$ minimizing the Willmore functional $1/4\\int |H|^2$, where $H$ is the mean curvature. 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