@Article{ (J._BUENO_GARCÍA_GONZÁLEZ_LOZANO_MELGAREJO_PANS_NAVAS:399-406,

author = { PIERRE AUGER COLLABORATION (J. ABRAHAMS ET AL.) and ANTONIO BUENO VILLAR and DIEGO GARCÍA GÁMEZ and JAVIER GONZÁLEZ TABOADA and JOSE JULIO LOZANO BAHILO and ANTONIO JESÚS MELGAREJO FERNÁNDEZ and VÍCTOR PANS MOLINA and SERGIO NAVAS CONCHA } ,

title = { UPPER LIMIT ON THE COSMIC-RAY PHOTON FRACTION AT EEV ENERGIES FROM THE PIERRE AUGER OBSERVATORY },

journal = { ASTROPARTICLE PHYSICS },

year = { 2009 },

volume = { 31 },

issn = { 0927-6505 },

pages = { 399-406 },

doi = { http://dx.doi.org/10.1016/j.astropartphys.2009.04.003 },

}