?url_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal&rft.aulast=Tajima&rft.aufirst=O&rft.au=Tajima%2C+O&rft.issn=0031-9007&rft.title=PHYS+REV+LETT&rft.issue=13&rft.atitle=Search+for+invisible+decay+of+the+Upsilon(1S)&rft.volume=98&rft.date=30+March+2007&rft.genre=article