http://scholar.google.com/
How are articles ranked?
Google Scholar aims to sort articles the way researchers do, weighing the full text of each article, the author, the publication in which the article appears, and how often the piece has been cited in other scholarly literature. The most relevant results will always appear on the first page.
http://apps.isiknowledge.com
Discover
ISI Web of Knowledge
Quickly find, analyze, and manage information in the sciences, social sciences, arts, and humanities with this versatile workflow solution.
• Want to know more?
• Training in multiple languages
Use the Web of Science tab for:
• Cited Reference Searching
• Author Finder
• Address Searching
• Sorting results by Times Cited
• Citation Reports (h-index
https://www.scopus.com/
Scopus is the largest abstract and citation database. It covers:
• 15,000 peer-reviewed journals from more than 4,000 international publishers, including coverage of:
• Over 1200 Open Access journals
• 500 Conference Proceedings
• Over 600 Trade Publications
• 200 book series
• 33 million records, of which:
• 16 million records include references going back to 1996 (75% include references)
• 17 million pre-1996 records go back as far as 1841
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