著者名,書名,版表示,出版者名,出版年,シリーズ名,番号,ISBN,ISSN,URL "山崎, 剛志",Intra-group heterogeneity in asymmetric contests with free riding,,"Faculty of Economics, Niigata University",2007,Working papers,,,,https://cir.nii.ac.jp/crid/1130000798199800192