Google Scholar

Google Scholar is a freely accessible web search engine that indexes the full text of scholarly literature across an array of publishing formats and disciplines. Google Scholar index includes most peer-reivewed online journals of Europe and America’s largest scholarly publishers, plus scholarly books other non-peer reviewed journals.

It is similar in function to the freely available Scirus from Elsevier, CiteSeerX, and getCITED.  It is also similar to the subscription-based tools, Elsevier’s Scopus and Thomson ISI’s Web of Science.

Google Scholar