@techreport{oai:repository.dl.itc.u-tokyo.ac.jp:00042147,
 author = {Matsushima, Hitoshi},
 month = {Mar},
 note = {application/pdf, 本文フィルはリンク先を参照のこと},
 title = {Finitely Repeated Prisoners'Dilemma with Small Fines : Penance Contract},
 year = {2010}
}