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comment complex integral with non integer power
@RonGordon in the first integral I mean triple integral over all the 3d space. Replacing $\mathrm{d}^3\mathbf{q}$ by $q^2\cos\theta\cos \phi$ and integrating over $\phi$ and $\theta$ I obtained the second equation. It is possible that I made a mistake doing this change of variable.
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