Shimson Kleuger birth and death dates citation

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Hi, I took the birth and death dates for Kleuger from the Russian Wiki article about him. They are also the same on the German and Polish versions. However, none of these sites seem to cite them. Can I cite another Wikipedia page? I continue to look for external proof, but these dates seem pretty much accepted. Ivan007 (talk) 12:43, 19 February 2020 (UTC)Reply