2) Engineering Index (EI), founded in 1884, is a famous comprehensive retrieval tool for engineering technology published by American Engineering Information Company.
3) American Chemical Abstracts (CA). The amount of chemical and chemical literature reported by CA accounts for about 98% of the total global chemical and chemical literature, and it is the most famous, comprehensive and widely used large-scale retrieval tool for searching chemical and chemical literature in the world.
4) British Scientific Abstracts (SA) Scientific Abstracts are retrieval information periodicals published by the British Institute of Electrical Engineers (IEE). Established in 1898. It is used to consult the literature of physics, electrician, electronics, computer and control.
5) Russian Abstract Journal (AJ for short) is a comprehensive information retrieval publication for consulting natural science, technical science and industrial economic literature. Founded in 1953, edited and published by the Soviet Union-Soviet Institute of Science and Technology Information.
6) Correct Bulletin of Japanese Science and Technology (CBST；; For printed version, *** 12 fascicle). Now it has been expanded into a large database "Japan Information Center Science and Technology (JICST)". A magazine that refers to all scientific and engineering-related documents except basic mathematics and astronomy. Short for quick report.