Proof of #P-completeness of the number of simple paths in a simple graph

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I have a simple non-directed graph and I am trying to find an algorithm to solve the number of simple paths that are possible. The problem is that I have seen in some forums that this problem is #P-Complete. Is there any proof of the #P-completeness of this problem? I need to find the proof of #P-Completeness or at least know how to deduce it myself in order to justify that there is no efficient algorithm for this problem.