Google Scholar Boolean Search on Citing Articles

"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...."