?url_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal&rft.aulast=Chatrchyan&rft.au=Chatrchyan%2C+S&rft.aufirst=S&rft.volume=109&rft.issn=0031-9007&rft.title=Physical+Review+Letters&rft.date=21+September+2012&rft.issue=12&rft.atitle=Search+for+a+light+pseudoscalar+Higgs+boson+in+the+dimuon+decay+channel+in+pp+collisions+at+%E2%88%9As+%3D+7+TeV.&rft.genre=article