Astroparticle Physics, 29, 243-256 Astroparticle Physics Astroparticle Physics, Elsevier, 2008, 29, pp.243-256. ⟨10.1016/j.astropartphys.2008.01.003⟩ Astroparticle physics 29, 243 (2008). doi:10.1016/j.astropartphys.2008.01.003 Astroparticle Physics, 2008, 29, pp.243-256. ⟨10.1016/j.astropartphys.2008.01.003⟩ SEDICI (UNLP) Universidad Nacional de La Plata instacron:UNLP The Pierre Auger Collaboration Pastor Carpi, Sergio Pinto, Teguayco 2008 Upper limit on the cosmic-ray photon flux above 10^19 eV using the surface detector of the Pierre Auger Observatory Astroparticle Physics 29 4 243 256 RODERIC. Repositorio Institucional de la Universitat de Valéncia instname Astroparticle Physics, 29, 4, pp. 243-256