<U>Yamamoto, Hitoshi</U>, Kazunari Ishida and Toshizumi Ohta (担当:共著, 範囲:Evolution of Cooperative Behavior in C2C Market: Effect of Reputation Management System)
<U>Yamamoto, Hitoshi</U>, Kazunari Ishida and Toshizumi Ohta (担当:共著, 範囲:Temptation and Contribution in C2C Transactions: Implications for Designing Reputation Management Systems)