@phdthesis{oai:tsukuba.repo.nii.ac.jp:00027576,
 author = {西原, 宏},
 month = {},
 note = {2011},
 school = {筑波大学, University of Tsukuba},
 title = {非協力行動の観察可能性による社会的ジレンマの解消について},
 year = {2012}
}