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NEC
NEC 

Scientific literature digital library sponsored by NASA, National Science Foundation, and Microsoft Research. Most of the papers available are free.

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PubMed
PubMed 

A service of the National Library of Medicine and the National Institutes of Health.
PubMed is a service of the U.S. National Library of Medicine that includes over 17 million citations from MEDLINE and other life science journals for biomedical articles back to the 1950s. PubMed includes links to full text articles and other related resources.


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Google Scholar
Google Scholar 

Google Scholar generally provides a higher citation count than ISI, this might not be true for all fields of studies.

The social sciences, arts and humanities, and engineering in particular seem to benefit from Google Scholar's better coverage of (citations in) books, conference proceedings and a wider range of journals.
The Natural and Health Sciences are generally well covered in ISI and hence Google Scholar might not always provide higher citation counts. In addition, for some disciplines in the Natural and Health Sciences Google Scholar's journal coverage seems to be patchy. This leads to citation counts in these areas that might even be much lower than those in ISI.
As a general rule of thumb, I would suggest that using Google Scholar might be most beneficial for three of the GS categories: Business, Administration, Finance & Economics; Engineering, Computer Science & Mathematics; Social Sciences, Arts & Humanities. Although broad comparative searches can be done for other disciplines, I would not encourage heavy reliance on Google Scholar for individual academics working in other areas without verifying results with either Scopus or WoS.


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