1、ProQuest .
This database is a relatively complete database of master's and doctoral dissertations.
SpringerLink .
There are many subjects, such as chemistry, computer science, economics, engineering and so on. 1 1 disciplines, many of which are core journals.
3, 4 e-books.
A professional website that provides free download of computer e-books has a large number of computer programming technology e-books. Thousands of free computer e-books and programming knowledge can be provided at your request.
Many books.
It is also a free e-book download website. The advantage is that dozens of e-book formats can be saved, and PDF, RTF and JAR can be switched at will.
5. Scientific direct database.
It is an online full-text database launched by ElsevierScience Company in the Netherlands, which digitizes all its 1 568 periodicals.
6.UMI doctoral thesis database.
You can query the information of more than 65438 universities in Europe and America 1000 dissertations, among which some dissertations since 1997 can not only see the abstract index, but also see the original text of the first 24 pages.
7.IEL(IEEE/IEEE Electronic Library) full-text library.
It contains more than 6000 kinds of conference proceedings (full text) published by American Institute of Electrical and Electronics Engineers (IEEE) and British Institute of Electrical Engineers (IEEE) since 1988.