?url_ver=Z39.88-2004&rft_id=doi%3A10.1371%2Fjournal.pone.0095809&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal&rft.aufirst=Guido&rft.au=Caldarelli%2C+Guido&rft.aulast=Caldarelli&rft.volume=9&rft.title=PloS+One&rft.atitle=A+multi-level+geographical+study+of+Italian+political+elections+from+Twitter+Data&rft.date=May+2014&rft.pages=e95809&rft.issue=5&rft.issn=1932-6203&rft.genre=article