著者名,論文名,雑誌名,ISSN,出版者名,出版日付,巻,号,ページ,URL,URL(DOI)
,An upper limit to the photon fraction in cosmic rays above 10 19 eV from the Pierre Auger Observatory,Astroparticle Physics 27,,,2007,,,155-176,https://cir.nii.ac.jp/crid/1010000782012109209,