In the world of journal articles, each article is both a "citing" item and a "cited" item. The list of references a given article cites provides that article's
outgoing citations. And all the other articles in whose reference lists that article is cited provide that article's
incoming citations.
Formerly, with
Google Scholar (first launched in
November 2004) (1) you could do a google-like boolean (and, or, not, etc.) word search, which ranked the articles that it retrieved by how highly cited they were. Then, for any individual citing article in that ranked list of citing articles, (2) you could go on to retrieve all the articles citing that individual cited article, again ranked by how highly cited they were. But you could not go on to do a boolean word search within just that set of citing articles;
as of July 1 you can. (Thanks to
Joseph Esposito for pointing this out on liblicense.)
Of course, Google Scholar is a potential scientometric killer-app that is just waiting to design and display powers far, far greater and richer than even these. Only two things are holding it back: (a) the sparse Open Access content of the web to date (only about 20% of articles published annually) and (b) the sleepiness of Google, in not yet realizing what a potentially rich scientometric resource and tool they have in their hands (or, rather, their harvested full-text archives).
Citebase gives a foretaste of some more of the latent power of an Open Access impact and influence engine (so does
citeseerx), but even that is pale in comparison with what is still to come -- if only Green OA self-archiving mandates by the world's universities, the providers of all the missing content, hurry up and get adopted so that they can be implemented, and then
all the target content for these impending marvels (not just 20% of it) can begin being reliably provided at long last.
(Elsevier's
SCOPUS and Thomson-Reuters'
Web of Knowledge are of course likewise standing by, ready to upgrade their services so as to point also to the
OA versions of the content they index -- if only we hurry up and make it OA!)
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