1. Author approach: Many retrieval systems have author index and institution index, while patent literature retrieval systems have patentee index. The way to search from the names of authors, editors, translators and patentees or the names of institutions and groups through these indexes is collectively called author mode.
2. Titles include titles, titles and titles. Some retrieval systems provide retrieval methods by title, such as title catalogue and periodical catalogue.
3. Classification method: Search documents according to the subject classification system. This practice is based on the knowledge system, so it can better reflect the discipline system, reflect the subordinate, derivative and parallel relationship between disciplines and things, facilitate us to find documents from the scope of disciplines, and can play the role of "drawing inferences from others". Classified retrieval mainly uses classified catalogue and classified index.
4. Subject method: search the literature by keywords that reflect the content of the literature. Because the thematic method can reflect all aspects of a theme, it is convenient for readers to conduct a comprehensive and systematic thematic study on a certain problem, thing and object. We can find all aspects of the literature on the same subject through the subject catalogue or index.
5. Citation channels: References or citations attached to documents are one of the external characteristics of documents. The index system compiled by using this citation is called citation index system, which provides a method to retrieve cited papers from cited papers, called citation method.
Introduction to literature retrieval
Information retrieval refers to the process of obtaining documents according to the needs of study and work. In modern times, literature refers to articles and books with historical value or important books and materials related to a certain subject. With the development of modern network technology, literature retrieval is more accomplished by computer technology.