?url_ver=Z39.88-2004&rft_id=doi%3A10.5194%2Fnpg-17-293-2010&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal&rft.au=Cho%2C+N.+F.&rft.aulast=Cho&rft.aufirst=N.+F.&rft.issue=4&rft.volume=17&rft.date=2+July+2010&rft.issn=1607-7946&rft.atitle=A+simple+metric+to+quantify+seismicity+clustering&rft.title=Nonlinear+Processes+in+Geophysics&rft.pages=293-302&rft.genre=article