The four commonly used literature retrieval tools are as follows:
1. CNKI: It is the most authoritative academic resource database in China, providing a wealth of Chinese literature retrieval resources. Covering academic journals and important conference papers in various subject areas, it is one of the preferred tools for finding Chinese literature.
2. Wanfang Database: It is also a well-known literature retrieval tool in China, mainly for digital journals in the fields of engineering, science and medicine, including dissertations, conference papers, journal articles, etc. At the same time, it also provides some special data resources, such as invention patents, scientific and technological achievements, etc.
3. PubMed: It is a database service system provided by the Center for Drug and Biological Resources Research established by the National Institutes of Health (NIH). It is the earliest biomedical literature database in the world, including 1950 to the present. Biomedical journals cover a large number of clinical trials, disease diagnosis and treatment guidelines, case reports and other documents.
4. Web of Science: consists of SCI and citation index, covering many subject areas. The core journals in the Web of Science have an important influence in academic evaluation and are an important window to understand the scientific research situation of various universities.
Basic methods of literature retrieval
1. Sequential search method: Sequential search method is a time sequence from the past to the present, using documents from far to near to conduct research on a certain topic. A step-by-step, systematic search. This method is suitable for retrieving large-scale documents and can provide a comprehensive understanding of the system situation of a certain topic. Using the sequential search method, you only need to enter keywords in order to search according to the time development order of the search topic.
2. Backward search method: The backward search method starts from the recent past and searches the literature from near to far. It is especially suitable for retrieval of short-term literature. This method is particularly suitable for understanding recent research trends and the latest research results. Using the backward search method, you can first enter a recent date, and then select the latest documents or the most recent entrance to search, so that you can quickly get the latest documents.
3. Spot check method: The spot check method is to carry out regular or irregular sampling searches for a large number of documents in a certain period, a certain major or a certain topic. This method is suitable for understanding the research trends and latest results in a certain professional field. Using the spot check method, you can select appropriate professional fields for retrieval through professional search engines, database websites or forums, and conduct random inspections regularly as needed.
4. Traceability method: Traceability method is a retrieval method that searches for the references listed at the end of the document and traces the original text one by one to obtain relevant documents. This method is suitable for in-depth understanding of research materials on a certain topic. Using the traceback method, you can first enter keywords to search. After finding relevant documents, read the references carefully to find other needed documents.