Some information from an article in 4 August 2011 Nature, "Computing giants launch free science metrics". If you don't have free access to Web of Science and want to get data on citations for an author or article, try the new free services from Google and Microsoft.

Overview:  Google Scholar Citations

A Google Scholar Universal Gadget that enables users to search for the total number of citations of author(s). It provides a total citation count, total number of cited publications and Jorge E. Hirsch's <http://en.wikipedia.org/wiki/Hirsch_number>H-Index.

http://code.google.com/p/citations-gadget/

If you put the name in quotation marks when searching on an author's name, it will do a better job of restricting search to the desired author, I've found. I think this program also includes books by the author, which I don't think Web of Science does. I found that for my own name, at least the numbers reported are:

                        Web of Science          Google
# papers cited          62                      54

# citations             2547                    3181

H index                 27                      29

In a future feature users will be able to create a personal profile showing all their articles in the Google Scholar database. You can sign up to be notified when this feature is made available beyond the current beta testers.

Microsoft Academic Search has some similar features to GSC, including visualizations of citation networks (I'm linked to Paul Erdos by only 4 links, I discovered), but has indexed a much smaller amount of literature than GSC.

David Inouye

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