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Some documents may be only half, and a few documents downloaded from sci-hub are incomplete or irrelevant.

In addition, sci-hub is an open document collection platform, and some documents can be downloaded for free.

People can get some documents they need by searching websites, but the website SCHIHUB has been banned by many publishers, so the website of SCHIHUB will change frequently. So every time you need a document, you'd better search the website again to prevent it from being changed.