@article{oai:toyo.repo.nii.ac.jp:00007167,
 author = {Yusuke, Samejima},
 issue = {2},
 journal = {経済論集, The Economic Review of Toyo University},
 month = {Mar},
 pages = {173--199},
 title = {Gradualism in voluntary contribution games due to very small uncertainties},
 volume = {40},
 year = {2015}
}