title: pull the citations for a paper from google scholar using R
body: <p>Using google-scholar and R, I'd like to find out who is citing a particular paper.</p>
  
  <p>The existing packages (like <a href="http://cran.r-project.org/web/packages/scholar/index.html">scholar</a>) are oriented towards H-index analyses: statistics on a researcher.</p>
  
  <p>I want to give a target-paper as input. An example url would be:</p>
  
  <p><a href="https://scholar.google.co.uk/scholar?oi=bibs&amp;hl=en&amp;cites=12939847369066114508">https://scholar.google.co.uk/scholar?oi=bibs&amp;hl=en&amp;cites=12939847369066114508</a></p>
  
  <p>Then R should scrape these citations pages (google scholar paginates these) for the paper, returning an array of papers which cite the target (up to 500 or more citations). Then we'd search for keywords in the titles, tabulate journals and citing authors etc.</p>
  
  <p>Any clues as to how to do that? Or is it down to literally scraping each page? (which I can do with copy and paste for one-off operations).</p>
  
  <p>Seems like this should be a generally useful function for things like seeding systematic reviews as well, so someone adding this to a package might well increase their H :-)</p>