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What are the literature retrieval websites?
The document retrieval websites are as follows:

1, China Knowledge Network (CNKI Academic).

2. Wanfang Data Knowledge Service Platform.

3.VIP data.

4. China Scientific Papers Online.

5. Baidu Academic.

6.plos Public Science Library.

7. World Digital Library.

8. China National Digital Library.

9. China Science and Technology Literature Service System.

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