?url_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal&rft.au=Estevez-Perez%2C+Graciela&rft.aulast=Estevez-Perez&rft.aufirst=Graciela&rft.issue=3%2F4&rft.volume=45&rft.date=August+2002&rft.issn=2037-416X&rft.atitle=Nonparametric+analysis+of+the+time+structure+of+seismicity+in+a+geographic+region&rft.title=ANNALS+OF+GEOPHYSICS&rft.pages=497-511&rft.genre=article