Weierstrass definition of the Gamma function

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I want to cite Weierstrass's paper on his definition of the Gamma Function. So far I couldn't find any: I went to Wikipedia's page for the Gamma Function and it didn't cite his paper, I went to the Wikipedia page for the Weierstrass Factorization theorem and it didn't cite his paper. So do you know where to find the paper that has his definition?