?url_ver=Z39.88-2004&rft_id=doi%3A10.1029%2F2006JB004568&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal&rft.au=Lombardi%2C+Anna+Maria&rft.aulast=Lombardi&rft.aufirst=Anna+Maria&rft.issue=B2&rft.volume=112&rft.date=15+February+2007&rft.issn=0148-0227&rft.atitle=Evidence+of+clustering+and+nonstationarity+in+the+time+distribution+of+large+worldwide+earthquakes&rft.title=Journal+of+Geophysical+Research&rft.pages=313-320&rft.genre=article