?url_ver=Z39.88-2004&rft_id=doi%3A10.1785%2F0120060048&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal&rft.au=Field%2C+Edward&rft.aulast=Field&rft.aufirst=Edward&rft.issue=4&rft.volume=97&rft.date=6+March+2007&rft.issn=0037-1106&rft.atitle=A+Summary+of+Previous+Working+Groups+on+California+Earthquake+Probabilities&rft.title=Bulletin+of+the+Seismological+Society+of+America&rft.pages=1033-1053&rft.genre=article