1, special project method
Some special problems can be solved by searching from the specific order of noun terms, place names, personal names, organization names, trade names, biological common names and years contained in or related to literature information.
2. Code method
An index compiled according to a certain thing code, such as molecular formula index, ring index, etc. , which can be retrieved from a specific code order.
3. Numbering method
Some documents have specific serial numbers, such as patent number, report number, contract number, standard number, international standard book number and publication number. The file serial number is clear, short and unique, which is used to identify some files. Based on this, various serial number indexes can provide a way to retrieve literature information in the order of serial number itself.
4. Citation channels
References or quotations 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.
5, the author's way
Many retrieval systems have author index and institution index (institution author or institution to which the author belongs), and patent literature retrieval systems have patentee index. The method of searching from the names of authors, editors, translators and patentees or the names of institutions and groups by using these indexes is collectively called author method.
Baidu Encyclopedia-Literature Retrieval