Whip. Com, formerly known as "VIP Information Network", is a website founded by Chongqing VIP Information Co., Ltd., the founder of China periodical database construction. Since 1989, it has been committed to the scientific and rigorous research, analysis, collection, processing and other in-depth development and promotion of massive newspaper data.

China HowNet Knowledge Discovery Network Platform-provides domestic and foreign readers with unified retrieval, unified navigation, online reading and downloading services for China academic literature, foreign literature, dissertations, newspapers, conferences, yearbooks, reference books and other resources.

Google Academic is a document retrieval service, which mainly provides retrieval services for several academic document repositories such as VIP information and Wan Fang data. Only "reports, abstracts and citations" of these academic materials can be found through Google Academic Search. If you want to get the original text of these materials, you must also download them from these content providers.

Papers are often used to refer to articles that conduct research in various academic fields and describe academic research results, which are referred to as papers for short. It is not only a means to discuss problems in academic research, but also a tool to describe academic research results in academic exchanges. Including academic papers, graduation papers, dissertations, scientific papers, achievement papers and so on. Paper keywords are selected from the title, abstract and text of the paper, and they are words with substantive significance to express the central content of the paper. Keywords are words used by computer systems to index the content characteristics of papers, which are convenient for information systems to collect and provide readers with retrieval.