@book{oai:ir.ide.go.jp:00040240,
 author = {Shinichi, Shigetomi},
 month = {},
 note = {/711.3/A1006, application/pdf, OPS003500_006},
 publisher = {Institute of Developing Economies},
 title = {2. From Dyadic Cooperation to Group-Based Cooperation},
 year = {1998}
}