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What are the three major retrieval documents?
The three main literature retrieval databases are as follows:

1, SCI (SCIentific citation index): (sci) is a citation database founded and published by institute for scientific information (ISI) 196 1, covering comprehensive retrieval publications such as life science, clinical medicine, physical chemistry, agriculture, biology, veterinary medicine and engineering technology.

2.EI (EngineeringIndex): (Engineering Index, EI), founded by EI), 1884, published by American Engineering Information Company, covers journals, conference papers, scientific and technological reports and other documents in various disciplines of engineering technology.

3.ISTP is one of the three world-famous scientific and technological literature retrieval systems. TechnicalProceedings (ISTP), also published by ISI, was founded in 1978, reporting the conference papers of the annual scientific and technological conferences held around the world.

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