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In this case I believe it is more an issue coming from the authors of that particular article. They probably used some bibliography software that recorded the sci-hub as the address for some articles cited, although published articles are peer reviewed people rarely scrutinizes all aspects of an article that finely to pick such issues.

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Some citation formats require the URL if an article came from an online source and the date when it was fetched.

But Doi with publication date alone should be enough as the url and fetch date?

Though sometimes different faculties in same campus have their own absurd formatting rules...

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