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) ,The leading eight : social norms that can maintain cooperation by indirect reciprocity.,Journal of Theoretical Biology 239,,,2006,,,435-444,https://cir.nii.ac.jp/crid/1010000781620733312,