1.GoogleScholar): Google Academic is a free academic search engine, which can search academic papers, dissertations and conference papers all over the world. It provides full-text search, citation search, advanced search and other functions, which can help users find relevant papers and periodicals quickly.
2.Webofscience: Webofscience is an academic citation database launched by institute for scientific information (ISI), including academic journals, conference papers, books, etc. All over the world. It provides a comprehensive search and analysis function of academic resources, which can help users to know the citation of a paper, the author's academic influence and other information.
3.Scopus: Scopus is a comprehensive academic citation database launched by Elsevier, which includes academic journals, conference papers and books from all over the world. It provides a comprehensive search and analysis function of academic resources, which can help users to know the citation of a paper, the author's academic influence and other information.
4.PubMed: PubMed is a literature database in the biomedical field launched by the National Library of Medicine (NLM), including biomedical journals and conference papers from all over the world. It provides a comprehensive search and analysis function of biomedical resources, which can help users to know the citation of a paper, the academic influence of the author and other information.
5. China Knowledge Network (CNKI): China Knowledge Network is the general repository of knowledge resources in China, including academic journals, conference papers and dissertations in various fields in China. It provides a comprehensive search and analysis function of academic resources, which can help users to know the citation of a paper, the author's academic influence and other information.