The discussion on impact factors got me wondering - is there a public, free access citation database for articles in Medline / Pubmed? I know of Scopus, ISI WOS (but theyre not free, and their content is proprietary) and Google Scholar (only give 'cited by', when I want 'this article cites x and y')?
How would one build such a database, if its not accessible? I know that ISI actually scans articles (not doable by myself) - I don't know how Scopus got their index, though.
Such a database would help tremendously on some bibliomics work I'm doing. Is it technically feasible to get references for all Medline articles (at least, those past 1996?). Where would you get the information - scrape/spider&index publishers website, if this information is even freely accessible (without a subscription?) and then match against a local Medline database (which I already have)? If anyone can help, it'd be appreciated :)