User talk:185.211.158.211
October 2023
[edit]
Please do not add or change content, as you did at Fourier series, without citing a reliable source. Please review the guidelines at Wikipedia:Citing sources and take this opportunity to add references to the article. ReaearchGate is not a WP:RS. Favonian (talk) 08:02, 19 October 2023 (UTC)
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