In academic paper writing, databases and retrieval tools are very important resources. Here are some commonly used databases and retrieval tools:

1.WebofScience: This is a comprehensive academic information resource library, covering natural science, social science, art, humanities and other fields. It provides functions such as document retrieval, citation analysis and author retrieval.

2.Scopus: This is a global abstract and citation database, covering the fields of science, technology, medicine and social sciences. Provide full-text search, topic analysis, author retrieval and other functions.

3.PubMed: This is a literature database in biomedical field, including MEDLINE, life science journals and online books. Provide keyword search, topic search, author search and other functions.

4.GoogleScholar: This is a free academic search engine, which can search academic papers, dissertations, conference papers and other resources all over the world. Provide keyword search, author search, organization search and other functions.

5.CNKI: China HowNet is a comprehensive academic information resource library, covering natural science, social science, humanities and other fields. It provides functions such as document retrieval, citation analysis and author retrieval.

6.ElsevierScienceDirect: This is a comprehensive academic journal platform, covering natural science, engineering technology, medicine and health, social science, humanities and other disciplines. Provide full-text search, topic analysis, author retrieval and other functions.