Fermi Large Area Telescope Constraints on the Gamma-ray Opacity of the Universe
A A Abdo, Natl Acad Sci,M Ackermann,M Ajello,A Allafort, Slac,Menlo Park Kipac,Phys Dept Stanford U,W B Atwood,Santa Cruz Uc,L Baldini,J Ballet,Saclay Aim,G Barbiellini,Trieste Infn,U Trieste,Matthew G Baring, U Rice,D Bastieri,U Padua,B M Baughman,U Ohio State,K Bechtol,R Bellazzini,B Berenji,P N Bhat,Huntsville Alabama U,Roger D Blandford,E D Bloom,E Bonamente,Perugia Infn,U Perugia,A W Borgland, A J Bouvier,T Brandt, Cesr Toulouse,U Bari,Bari Infn,Ecole Polytechnique, Seattle Washington U, Bellaterra Ice,Milan Iasf,Frascati Asdc,Goddard Nasa, Greenbelt Cresst,Baltimore Csst, U George Mason, U Montpellier,U Stockholm,Okc Stockholm U, Udine Infn, U Udine,Los Alamos,More Authors The Astrophysical Journal（2013）
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