@article{oai:tsukuba.repo.nii.ac.jp:00029889,
 author = {平山, 朝治 and HIRAYAMA, Asaji},
 journal = {筑波大学経済学論集, The University of Tsukuba economic review},
 month = {Mar},
 pages = {1--59},
 title = {The evolution of reciprocity and exchange},
 volume = {66},
 year = {2014},
 yomi = {ヒラヤマ, アサジ}
}