The seven most comprehensive literature retrieval methods in the history of hownet papers are knowledge meta-retrieval, index retrieval, advanced retrieval, author retrieval, sentence retrieval, citation retrieval and subject retrieval.

1, knowledge element retrieval

It is suggested that knowledge meta-search must be used before retrieval. When you have a keyword to search, you must search the meaning of the keyword and one or more documents containing the keyword through knowledge meta-search, so as to ensure that the keyword you choose is accurate. If they are inaccurate, you must modify them, otherwise the keywords are inaccurate or incorrect, and you will definitely not be able to search the document.

2. Index retrieval

After determining a keyword, the second step is to conduct index search, confirm the subject field and popularity of your keyword, and judge the research value.

3. Advanced retrieval

After entering the retrieval page, you can determine whether the keywords are correct and whether the research value is determined, so that you can conduct advanced retrieval, retrieve the core documents and find them from the core documents. After the above three steps are completed, the latter methods can be used alternately as needed.

4. Author search

Author retrieval is an authoritative expert article in the field of retrieval, focusing on the retrieval content.

5. Sentence retrieval

Through sentence retrieval, relevant documents can be accurately filtered. If combined with other retrieval methods, we can certainly retrieve the documents needed by the paper.

6. Citation retrieval

When using citation retrieval, there are generally more accurate references, but the number is small. We can start with one or two documents to find the cited documents and expand the scope of the documents.

7. Subject retrieval

In the case that no relevant literature can be found, it is suggested to use subject retrieval. In this case, without any additional conditions, the search scope is the widest, but the result is not accurate, so it is suggested that the above method cannot be used again.